---
title: "User Manual - PTX Pistol"
canonical: "https://help.gatee.eu/space/GHC/4216946721/User%20Manual%20-%20PTX%20Pistol"
format: markdown
---
Contents
> Macro (toc)
## General Information
Congratulations on purchasing the GATE PTX airsoft pistol.
The GATE PTX isn’t just a sidearm — it’s a compact, high-performance SMG in pistol form. For the first time in airsoft history, a compact pistol features a fully factory-integrated electropneumatic HPA engine: the **PULSAR S2**. Designed as our latest breakthrough, the** PULSAR S2** is engineered as a single unit with a VSR-style hop-up chamber and paired with the class-leading **ASTER II Bluetooth®** PTX electronic Fire Control Unit (FCU).
**The result?** A pocket-sized beast with consistent precision, an extremely fast trigger response and a level of configurability previously reserved only for full-size HPA platforms.
**PTX **is engineered for players who demand fingertip control, repeatable accuracy and rock-solid reliability — day in, day out — without the complications of traditional GBB systems.
---
## Safety information
Before using this product, read this information carefully. Keep this information for future reference. The information contained in this document may be updated on an ongoing basis.
### Definitions of safety notices
> ❌ **Warning**
> ❌ Situations that may cause injury to yourself or others.
> ⚠️ **Caution**
> ⚠️ Situations that may cause damage to your device or other equipment.
> ✅ **Note**
> ✅ Notes, usage tips or additional information.
### General safety
> ❌ **Warning**
> ❌ This device is not a toy and must not be operated by children or by persons with reduced physical or mental capabilities. Such persons may use the device only under the supervision of caregivers responsible for their safety.
> ❌ **Warning**
> ❌ This device is not suitable for use in places where children may be present.
> ❌ **Warning**
> ❌ Persons under 18 years of age must not remain near the airsoft replica without supervision.
> ❌ **Warning**
> ❌ Persons under 18 years of age must not perform any service or maintenance tasks on this device.
### Shooting safety
> ❌ **Warning**
> ❌
> ❌ - **Always assume the pistol is loaded **until you have physically checked the chamber and the magazine or disconnected the compressed-air HPA tank.
> ❌ - **Finger off the trigger **— keep your finger off the trigger until you are ready to fire.
> ❌ - **Never point the barrel at people or animals** — even if you believe the pistol is unloaded.
> ❌ - **Never look directly into the barrel.**
> ❌ - **Always wear eye protection** that meets ballistic standards (e.g. EN166).
> ❌ - **Wear full-face protection.**
> ❌ - **Ensure that all persons in the vicinity have appropriate eye and face protection.**
> ❌ - **Set the selector to SAFE** when carrying, transporting and outside the game area.
> ❌ - **Transport the pistol in a case or holster**, with the magazine, tank and battery disconnected. Do not expose the pistol to public view in public areas.
> ❌ - **Store the pistol secured**, out of reach of children and unauthorised persons; empty the hop-up chamber and disconnect all power sources and the HPA tank during longer-term storage.
> ❌ - **Do not use the device under the influence of alcohol, performance-impairing medication or drugs.**
> ❌ **Warning**
> ❌ Excessive trigger sensitivity may cause an accidental discharge.
> ❌ **Warning**
> ❌ When operating the replica with a battery connected, every person within range of the replica must wear personal protective equipment.
### Pneumatic safety
> ❌ **Warning**
> ❌ Use only compressed air in accordance with the manufacturer’s specifications. Do not use CO₂ or any other gases, especially flammable gases.
> ❌ **Warning**
> ❌ Do not exceed the permissible operating pressure of the replica, hoses, quick-disconnect fittings, regulator or tank. Always follow the values specified in the technical specifications.
> ❌ **Warning**
> ❌ Before each use, check the tightness of hoses, quick couplers and pneumatic connections. If any leak is detected (hissing sound, pressure drop), immediately disconnect the HPA source and do not use the device until the fault has been rectified.
> ⚠️ **Caution**
> ⚠️ Do not crush, kink or sharply bend HPA hoses. Avoid pulling the replica by the hose or hanging the replica from the hose, as this may damage the hoses and cause leaks.
> ⚠️ **Caution**
> ⚠️ Do not leave the HPA tank or the replica with HPA connected in places exposed to high temperatures (e.g. the interior of a car in direct sunlight, near heat sources). High temperature may cause the pressure in the tank to rise above permissible limits.
### Electrical safety
> ❌ **Warning**
> ❌ Take care to prevent a short circuit of the battery, as the consequences can be very dangerous to the user’s health. A battery short circuit may damage the battery and may even lead to fire or explosion.
> ❌ **Warning**
> ❌ Throwing a product containing a battery into a fire, or mechanically crushing or cutting the battery, may cause an explosion or fire, potentially resulting in burns and other bodily injuries.
> ❌ **Warning**
> ❌ Pay close attention to the correct polarity when connecting the battery. Ensure that the positive battery terminal is connected to the device’s red wire and the negative terminal to the black wire. Incorrect polarity may damage the device and could lead to battery fire or explosion.
> ❌ **Warning**
> ❌ When the device is not in SAFE (safe) mode, avoid using it near strong electromagnetic fields, such as PMR transmitters exceeding European limits, or in the presence of electrostatic discharges (e.g. lightning), which may cause device malfunction and an uncontrolled discharge.
> ❌ **Warning**
> ❌ Use and storage of the product at very low air pressure is prohibited. A battery inside the device exposed to very low air pressure may damage the product and cause fire, explosion or leakage of flammable liquid or gas, leading to burns and other bodily injuries.
> ⚠️ **Caution**
> ⚠️ Using a battery that does not comply with the specification may damage the pistol and is not covered by the warranty.
### Storage, transport and service
> ❌ **Warning**
> ❌ When the replica is not in use, its magazine must be disconnected or left empty, with no BBs inside. The hop-up chamber must be empty. The battery and compressed-air tank must be disconnected.
> ❌ **Warning**
> ❌ Do not store or transport flammable liquids, gases or explosive materials in the same room as the device, its parts or accessories.
> ⚠️ **Caution**
> ⚠️ When using the pistol in unusual conditions, perform maintenance procedures appropriate for the climate in your area, as described below. Use of the pistol in extremely low temperatures is not recommended. Do not expose the pistol to prolonged direct sunlight. Keep it away from dust and sand, as this may cause malfunctions and/or excessive wear. Protect the pistol from snow, rain and water. This will help prevent electrical failures and the accumulation of liquids inside the housing.
> ⚠️ **Caution**
> ⚠️ Modifying the pistol, replacing parts or tuning may damage the pistol and void the warranty. Modifications may also change the legal classification of the replica and are prohibited; in such cases the manufacturer’s warranty becomes void.
> ✅ **Note**
> ✅ The product warranty form is available on our website: [http://www.gatee.eu/warranty](http://www.gatee.eu/warranty) .
> ✅ **Note**
> ✅ If you experience any difficulty during installation or use of this product:
> ✅ a) contact us via the GATE HELP CENTER: [http://help.gatee.eu](https://help.gatee.eu/)
> ✅ b) send us an email at: [support@gatee.eu](mailto:support@gatee.eu)
> ✅ c) join the Airsoft Community Discord server: [http://discord.gatee.eu](https://discord.gatee.eu/)
> ✅ **Note**
> ✅ To connect a PTX pistol equipped with the ASTER II Bluetooth® electronic trigger unit to a smartphone or other device, Bluetooth 4.0 or higher is required.
---
## Device structure
1. Upper slider
2. Lower slider
3. Grip 1
4. Grip 2
5. Cap
6. Trigger
7. Trigger pin
8. FI5 pin
9. Fire selector
10. PULSAR S2 engine rear
11. PULSAR S2 nozzle
12. Spire
13. Hop-up chamber
14. Hop-up chamber chimney
15. Barrel sleeve
16. 148mm barrel
17. Hop-up chamber nub
---
## Included in the Set
- **GATE PTX pistol** — CNC-machined 7075 aircraft-grade aluminum body with matte anodized finish
- Built-in **PULSAR S2 HPA** engine (open-bolt, single-solenoid, integrated with VSR hop-up chamber)
- **ASTER II Bluetooth® V3 FCU** (configurable via GCS App)
- Optical trigger sensor + magnetic spring (adjustable trigger stop and sensitivity)
- Pre-installed 410 mAh 7.4 V HPA battery
- One 80-BB mid-cap magazine
- Hard carrying case
- GATE QD fitting [pistol side, 6 mm, US Standard]
- Repair kit
---
## Before you start
- Read the **safety instructions** in full, as well as local regulations regarding the use of airsoft replicas.
- Read the full user manual: [https://help.gatee.eu/](https://help.gatee.eu/)
- Make sure you have **full eye and face protection **(EN166 ballistic goggles + mask).
- Check that the pistol is unloaded and that the magazine and power sources (tank / battery) are disconnected.
- To start using the pistol, you need:
- an HPA tank with compressed air at 200bar/2900psi – 300ba/4360psi.
- a regulator with an operating range of at least 60 PSI/4bar – 140psi/10bar.
- To adjust the pistol settings, e.g. to change muzzle velocity, you must connect to the GATE GCS mobile app. For this purpose, refer to the full user manual: [https://help.gatee.eu/](https://help.gatee.eu/)
> ✅ **Note**
> ✅ The tank and regulator are **not included** in the set.
---
## Getting ready to play
1. **Connect the power supply**
- Remove the front pin and slide off the slide.
- Connect the battery to the JST connector.
- Make sure the regulator is set to the correct** operating pressure **(60-140 PSI)
- Check the tightness of hoses and quick-disconnect fittings.
- Connect the air tank.
2. **Load the magazine**
- Use only **high-quality 6 mm BBs.**
- For the best BB flight trajectory, use BBs weighing **0.32 g.**
- Do not exceed the **maximum magazine capacity.**
- Never use damaged or contaminated BBs.
3. **Adjust hop-up**
- Use the **M1.5 hex key** (included in the set).
- The hop-up is set to **0 (no backspin)** by default.
- To increase hop-up pressure, **turn the screw clockwise**.
- To decrease hop-up pressure, **turn the screw counterclockwise**.
- Adjust **slowly and carefully** — even a very small movement of the screw affects performance.
- **Test frequently** to achieve the best result for the BBs you use.
4. **Set the fire selector**
- **SAFE** position – at all times, until entering the field of play.
- **SEMI** or **FULL** position only in the shooting zone.
> ⚠️ **Caution**
> ⚠️ Each time after removing the upper, check that the trigger and fire selector are calibrated correctly before starting the game. If necessary, recalibrate the sensors in the GCS application.
---
## During operation
- **If you do not intend to fire, always point the barrel in a safe direction.**
- **Do not shoot from a distance shorter than that recommended by the event organiser.**
- **Do not exceed the permitted muzzle energy** (FPS/J limit in accordance with the country’s law and field rules).
- **In the event of any leak or malfunction**, immediately disconnect the HPA source and contact GATE service.
- **Do not use the pistol in public** places not designated for airsoft games.
- **Always wear eye protection** when using the replica.
- **Do not shoot** at animals or people who are not participating in the airsoft game.
---
## After the game
1. **Secure the pistol**
- Set the selector to **SAFE**.
- Remove the magazine and check that there are no BB's left in the chamber.
- Set the selector to **SEMI** and fire a test shot in a **safe direction** while wearing** face protection**.
- Set the selector to **SAFE**.
- **Disconnect the HPA tank.**
2. **Clean and store**
- **Disconnect** the battery.
- **Clean **the barrel using cleaning rods without aggressive chemicals.
- **Dry** the entire pistol if it is wet or damp.
- **Store **the pistol in a dry, safe place, out of reach of children and unauthorised persons.
> ⚠️ **Caution**
> ⚠️ Before removing the upper receiver, loosen the HOP-UP screw. Failure to do so may result in mechanical damage to the motor.
---
## Installation of accessories:
### Pistol compensator
1. Install the compensator by carefully sliding it onto the barrel's threads, and then tightly screw in the screw on the compensator
### Mounting plate for collimator and reflex sights
Place the mounting plate in the appropriate place on the pistol slide and secure it with the two screws provided in the kit.
## Tracer:
1. Remove the retaining pin and disassemble the upper receiver.
2. Unscrew the cover screws and remove the cover.
3. Disconnect the battery.
4. Remove the PULSAR S2 from the PTX housing.
5. Unscrew the pressure hose from the engine.
6. Unscrew the two screws and remove the hop‑up chamber neck.
7. Unscrew the mounting screw and remove the ASTER together with the PULSAR S2 unit.
8. Carefully cut the heat‑shrink tubing and unwrap the additional ASTER wires.
9. Trim the tracer unit wires to the required length.
10. Solder the tracer unit wires to the ASTER wires.
Install a voltage converter between the LEDs and the ASTER unit.
11. Reinstall the ASTER and secure it to the engine chamber using the mounting screw.
12. Ensure the plastic washer is placed under the screw before tightening.
13. Route all wires through the designated wire channels.
14. Reinstall the hop‑up chamber neck.
15. Install the tracer unit inside the PULSAR S2 hop‑up chamber.
16. Reconnect the pressure hose to the engine.
17. Reinstall the PULSAR S2 into the PTX.
18. Reconnect the battery.
19. Reinstall the cover and tighten the screws.
20. Reassemble the upper receiver and secure it with the retaining pin.
---
## Default PTX settings
PTX is delivered to the customer pre-configured, and the uploaded settings allow the replica to function correctly in most cases.
## Calibration of HPA engine control timing
1. Connect to PTX pistol using the GCS app by selecting “**+**”** **in the Dashboard.
2. Select the PTX pistol from the list. If this is the first connection, enter the PIN code provided with the product.
3. After connecting the ASTER II Bluetooth® to the GCS, update the firmware to the latest version.
4. After updating the ASTER II Bluetooth® firmware, tap the PTX icon.
5. Go to the **General **tab.
6. Tap the **HPA Engine **tab.
## PULSAR S2 Engine Calibration
1. Start the calibration by restoring the default settings, which work well for most replicas and provide a solid starting point for precise calibration.
2. Set the **Main Valve Time **to **15 ms**.
3. Proceed to chrono the replica. Depending on the BB weight, barrel length, and hop-up bucking, use the pressure regulator to set the desired BB muzzle velocity.
4. Decrease the **Main Valve Time** by **1 ms **at a time** **until the FPS begins to drop. If you notice a decrease in FPS, revert to the previous time value at which the FPS remained stable. This indicates that the **Main Valve Time** has been calibrated correctly.
5. Go to the **Main Valve Pause** setting. This value depends on the quality of the magazine being used: the weaker the spring in the magazine, the longer the pause will need to be. Calibrate this setting in the same way as the **Main Valve Time**. Start at **25 ms** and decrease by **1 ms** at a time until you notice interruptions in the the BB feed. Then revert to the previous time setting. If BB feed issues persist, increase the pause time as needed.
---
## Tooltips
**Main Valve Time** **(dP)** – Main Valve Time (Poppet Dwell – dP) – the opening time of the main solenoid valve. This setting allows you to adjust the muzzle velocity of the HPA replica and its gas consumption.
**Main Valve Pause** – the interval between consecutive shot cycles in a single-solenoid valve engine, or the interval between the intermediate solenoid valve cycle and the nozzle cycle in a dual-solenoid valve engine. This setting affects the stability of the hop-up and the overall operation of the engine (FPS).
**Anti-Stiction Timeout (iS)** – the time elapsed after the last shot is fired before additional boost time - **Anti-Stiction Pulse (iP)** - is applied.
**RPS Limit **–** **Rate of Fire – ROF (RPS) – this setting simulates the rate of fire based on the configured time settings. After calibrating the engine, the maximum achievable RPS will be displayed. The rate of fire can be reduced by lowering the RPS value.
---
## PULSAR S2 Engine Maintenance Manual
The PULSAR S2 requires periodic cleaning and maintenance. The frequency of use of the replica and the level of contamination in the system will determine the intervals between maintenance procedures. Perform preventive cleaning every six months if no operational issues are noticed earlier.
If the engine is not functioning properly, immediately disassemble it. Carefully remove the solenoid valve, as its seals are very delicate, and clean the engine thoroughly - for example, using petroleum ether. **Do not immerse the solenoid valve in solvents**; instead, clean it gently with dust-free paper.
Inspect the condition of all O-rings. Replace any that are damaged with new ones (spare O-rings are included in the kit; this does not apply to solenoid valve washers). Remove old O-rings carefully and install new ones without using sharp metal tools, as these can damage the O-rings or aluminum surfaces of engine components. Such damage may be permanent and is not covered by the warranty.
If you encounter any issues or have questions, contact our technical support department. All components are also available separately for post-warranty support.
---
### List of Tools
1. PULSAR S2 engine
1. Optional – spare O-rings included in the kit
2. Gun Sav grease from TechT (other greases may be used, but we cannot guarantee optimal engine performance)
3. Clean, fine brush - for applying the grease
4. Plastic tweezers - for removing and installing O-rings
5. Clean, stiff brush - for washing components
6. Degreasing agent - for all components, e.g., petroleum ether (must not damage O-rings)
7. Container - for washing components
8. Paper towels
#### How to Disassemble the PTX pistol
1. Disconnect the HPA supply from the PTX pistol
2. Remove the magazine and make sure there are no BBs left in the hop-up chamber.
3.Remove the connector from the high-pressure hose.
4. Remove the front pin and disassemble the slide by sliding it forward.
5. Disconnect the battery from the JST connector.
6. Unscrew the two screws located at the rear of the PTX and remove the solenoid cover.
7. Using tweezers, carefully disconnect the wire from the solenoid, then gently slide off the O-rings.
8. Remove the S2 engine—which is integrated with the barrel—from the gun body by gently lifting it upward.
9. Unscrew the high-pressure hose from the engine.
10. Unscrew the solenoid valve from the engine.
11. Remove the C-clip from the barrel.
12. Remove the 8x1.5 O-ring and the sleeve from the barrel.
13. Remove the barrel along with the hop-up bucking from the front of the engine.
14. Remove the nub from the hop-up chamber.
15. Clean the barrel using a paper towel soaked in isopropyl alcohol and a cleaning rod.
16. Unscrew the hop-up chamber sleeve.
17. Unscrew the ASTER PTX.
#### Maintenance of the internal engine components in the V1.0 version
1. Unscrew the rear part of the engine.
2. Remove the nozzle from the front section of the engine.
3. Remove the O-rings from the engine components, except for the solenoid valve. We recommend using plastic tools to avoid damaging the aluminum surfaces of the motor—such damage is not covered by the warranty.
a. 1x O-ring 20x1
b. 2x O-ring 11x1
c. 1x O-ring 8x1
d. 1x O-ring 6x1
e. If the O-rings are not damaged, they can be reused after wiping them clean with a paper towel. Avoid washing the O-rings with detergents.
f. If the O-rings are worn or damaged, replace them with new ones—included in the kit.
4. Place the engine components in a container with extraction gasoline (NOTE—this does not apply to solenoid valves. Do not submerge them in cleaning agents).
5. Using a stiffer brush and tweezers, thoroughly clean all engine components.
6. Gently wipe the solenoid valves with a paper towel, then remove any remaining dirt with a dry brush.
7. Set the cleaned parts on a paper towel to dry completely. You can speed up the process by blowing compressed air over the parts.
8. Lubricate all surfaces that come into contact with O-rings.
Thread on the rear of the S2 engine
Center of the rear of the S2 engine
Center of the front of the S2 engine
9. Reinstall the O-rings (lightly lubricate them before installation).
2x O-ring 11x1
1x O-ring 20x1
1x O-ring 8x1
1x O-ring 6x1
10. Insert the nozzle into the front part of the engine.
11. Assemble the rear part of the engine, the needle, the nozzle spring, and the nozzle cylinder.
a. Insert the needles into part S2 of the engine.
b. Insert the nozzle cylinder.
c. Insert the spring into the center of the nozzle cylinder.
12. Screw the assembled rear part of the engine (S2) to the front section.
#### Maintenance of the internal engine components in the V22 version
1. Unscrew the rear engine from the hop-up chamber
2. Remove the cylinder, spring, and nozzle
3. Remove the spring stabilizer from inside the cylinder
4. Remove the 20x1 O-ring from the rear of the engine
5. Remove the 7x1.5 O-ring from the rear of the engine
6. Remove the two 11x1 O-rings from the nozzle
7. Clean all engine components
8. Install the 11x1 O-rings on the nozzle after lightly lubricating them
9. Install the 20x1 O-ring on the rear housing after lightly lubricating it
10. Lubricate the inside of the engine rear housing and the thread
11. Install the 7x1.5 O-ring on the rear housing after lightly lubricating it
12. Insert the spring guides into the cylinder, then lubricate the inside of the cylinder
13. Lubricate the O-rings and the front of the nozzle, then insert it into the hop-up chamber
14. Place the spring on the nozzle
15. Install the cylinder
16. Screw the rear section onto the hop-up chamber
#### Maintenance of the internal engine components in the V31 version
1. Unscrew the rear from the hop-up chamber
2. Remove the cylinder, spring, and nozzle
3. Remove the 20x1 O-ring from the rear engine
4. Remove the 7x1.5 O-ring from the rear engine
5. Remove the O-ring washer from the rear engine
6. Remove the two 11x1 O-rings from the nozzle
7. Clean all engine components
8. Install the 11x1 O-rings onto the nozzle after lightly lubricating them
9. Install the 20x1 O-ring onto the rear housing after lightly lubricating it
10. Lubricate the inside of the rear housing and the threads
11. Install the 7x1.5 O-ring onto the rear housing after lightly lubricating it
12. Lubricate the inside of the cylinder
13. Lubricate the front of the nozzle and insert it into the hop-up chamber
14. Install the spring on the nozzle
15. Install the cylinder
16. Screw the rear housing onto the hop-up chamber
#### How to Assemble the PTX Pistol
1. Gently slide the barrel—with the hop-up rubber ring already installed—into the chamber so that the rubber ring seats properly in its slot.
> ℹ️ The hop-up bucking may vary depending on the generation of the PTX pistol.
2. Install the barrel sleeve and the 8×1.5 O-ring onto the barrel.
> ℹ️ The V22 and V31 versions have a larger barrel stabilizer.
3. Place the C-clip on the hop-up chamber. The C-clip must fit snugly and securely, without excessive tension or deformation.
4. Install the nub.
5. Screw the high-pressure hose into the PULSAR S2 engine.
6. Screw the solenoid valve into the engine.
7. Insert the assembled PULSAR S2 engine into the PTX pistol body, taking care when routing the high-pressure hose—it should pass through the designated opening, not through the magazine well.
8. Attach the upper receiver of the PTX pistol and insert the pin.
9. Install the solenoid valve cover and secure it with two screws. Make sure the screws are tightened sufficiently so that the upper latch has no play.
10. Install the QD fitting on the high-pressure hose.
## Repair kit
Use the repair kit if any O-rings are damaged or worn.
**Contents:**
- 1x Allen key, 1.5 mm
- 1x O-ring 20 x 1, 70 NBR
- 2x O-ring 11 x 1, 70 NBR
- 1x O-ring 5 x 1, 70 NBR
- 1x O-ring 6 x 1, 70 NBR
- 2x O-ring 8 x 1, 70NBR
- 1x O-ring 9 x 1.5, 70 NBR
- 1x O-ring 8 x 2, 70 NBR
- 1x O-ring 12 x 1.5, 70 NBR
- 1x Hop-up chamber nub
- 1x PTX fire selector sticker
- 1x PTX trigger sticker
## Troubleshooting
### **Air freely escaping through the barrel**
Currently (with the latest engine version where other possible causes have been eliminated ) if the problem of air freely escaping through the barrel occurs, the most common cause is a curled hose or another low-flow hose. If the engine gets stuck in the position where it releases air through the barrel, **connect it directly to the regulator and check whether the issue still occurs when bypassing the extension hose**. If the problem disappears, replace the hose with one that has a higher flow rate.
### BB freely rolling out of the barrel
The second commonly encountered issue is an incomplete engine cycle. This typically looks as the BB freely rolling out of the barrel, especially during the first shots, instead of being properly fired. This situation indicates that the valve is open for too short a time. You need to increase the dP time. If the problem occurs in low temperatures, enable the anti-stiction function
### **Low FPS**
> ❌ **Warning**
> ❌ Always disconnect the pressure source and the power supply from the replica while performing checks to ensure safety.
### **Leak at the hop-up bucking/nozzle connection**
> ❌ **Warning**
> ❌ Ensure the replica is safe to handle: disconnect the magazine, make sure there is no BB in the chamber, and observe all safety precautions.
**Check procedure:**
1. Plug the barrel with your finger and fire a single shot in **Single Solenoid Valve Engine mode** with the pressure connected. After firing, the nozzle should remain closed, and pressure should stay in the barrel until you remove your finger from the muzzle.
2. If you hear a hiss of air escaping from the chamber, the hop-up bucking is not sealing properly with the nozzle.
**Troubleshooting steps:**
1. **Clean the nozzle:** Remove any dirt or debris
2. **Check the hop-up rubber:** Clean it, or replace it with a new one if necessary.
**Bent air hose in the gearbox**
1. Open the replica and inspect the high-pressure hose. Ensure it is neither bent nor damaged.
2. Reconnect the pressure and check for leaks around the hose.
3. If air escapes, secure the high-pressure hose to the engine body properly.
**Non-optimal engine settings in GCS**
1. Restore the default HPA Engine settings.
2. Increase the Main Valve as needed to optimize performance
### **Unstable FPS**
Hop-up bucking collar curling up:
- Use a different hop-up rubber.
Damaged regulator:
- Check whether the regulator is supplying and refreshing pressure correctly.
### **No BB feed**
Excessively low operating pressure:
In some cases - such as low ambient temperatures or replacing the tappet plate spring with a stiffer one - it may be necessary to increase the operating pressure. This may result in a higher firing rate. To maintain the desired FPS, the **Main Valve Time (DP)** must then be reduced.
Adjustment procedure:
1. Increase the regulator pressure until BBs are fed reliably.
2. Reduce the **Main Valve Time (DP)** until the desired muzzle velocity is achieved.
---
## FAQ – Frequently Asked Questions
#### Which hop-up bucking should be used with the PULSAR S2 engine?
The choice of hop-up bucking depends on the hop-up chamber, the power output of the replica, and the BBs used. We recommend testing buckings individually in your specific setup, as there is no universal solution that works in every configuration.
Based on our experience, the following hop-up buckings most commonly work correctly:
> ⚠️ **Caution**
> ⚠️ The PULSAR S2 engine is compatible **only with GBB/VSR hop-up rubbers.**
- SniperMechanic Flamingo Gen. 3
- Maple Leaf MR HOP/AUTOBOT
- 4UANTUM Friction Pro-high
We do **not** recommend using silicone hop-up buckings with PULSAR engines. Silicone buckings have lower resistance to friction and wear, causing faster degradation. Additionally, silicone materials tend to change their properties at extreme temperatures, which can negatively affect BB spin consistency.
**Which medium can be used to power the engine?**
High-pressure air (HPA) can be used safely. **CO₂ is not recommended**, as its use may cause permanent damage to the engine. Such damage is **not covered by the warranty**.
**What is the air hose thread?**
M5 thread with a 0.8 mm pitch.
**What is the length of the nozzle installed in the engine?**
The PULSAR S2 engine comes with a dedicated nozzle. Thanks to the engine innovative design, which is integrated into the Hop-Up chamber, users don’t have to worry about selecting the correct nozzle length for the replica to function properly
**Is the PULSAR S2 engine closed-bolt or open-bolt?**
The PULSAR S2 is a single-solenoid engine and operates in an open-bolt system.
**What is the maximum operating pressure for the PULSAR S2 engine?**
The engine is designed to operate at a maximum pressure of 140 PSI.
**Which regulators are compatible with the PULSAR S2 engine?**
- PolarStar MRS
- Redline SFR
- Wolverine STORM
---
## [User Manual: ASTER II Bluetooth® EXPERT for V3 GB [AEG & HPA]](https://help.gatee.eu/space/GHC/3410329602/User+Manual+%E2%80%93+ASTER+II+Bluetooth%C2%AE+EXPERT+for+V3+GB+%5BAEG+%26+HPA%5D)
> ✅ **Note**
> ✅ In case you have any difficulties while installing or using this product:
> ✅
> ✅ - contact us via: [GATE HELP CENTER](https://help.gatee.eu/space/GHC/4060676267/User+Manual+-+PULSAR+D2+Dual+Solenoid+HPA+Engine)
> ✅ - send us an email: [support@gatee.eu](mailto:support@gatee.eu)
> ✅ - join [GATE Airsoft Community Discord Server](https://discord.gatee.eu/)
---
## Charging the GATE EON Li‑Po Battery
1. Remove the retaining pin and disassemble the upper receiver.
2. Pull out the battery wires or remove the entire battery from the PTX housing.
3. Connect the battery to the charger:
- If you are using a charger equipped with **G‑Tech technology**, simply connect the battery. The charger will automatically detect the battery model and select the appropriate charging parameters.
- If you are not using a G‑Tech charger, manually set the charging parameters according to the battery manufacturer’s recommendations.
4. Once charging is complete, reinstall the upper receiver and secure it with the retaining pin.
> ℹ️ When the battery charge level drops to a safe minimum, the ETU will activate the UVP1 safety feature and firing will be disabled. This condition is indicated by a flashing orange LED visible through the opening near the trigger and lasts for 5 minutes. After connecting to the GCS, the message “UVP1” appears in the DIAGNOSTICS tab. After 5 minutes, the ETU will enter maximum power-saving mode.
### What is G‑Tech?
G‑Tech is an intelligent system that connects batteries and chargers within one ecosystem, designed for ease of use and maximum safety.
Batteries equipped with G‑Tech technology feature a built‑in smart chip inside the balance connector. This allows the charger to automatically recognize the battery parameters and select the correct charging profile.
As a result, the system operates in a true plug‑and‑play manner — without the need for manual parameter setup or configuration.
---
## Technical Specifications
The design and production of the device are based on harmonized standards.
| **Rated voltage** | 5-8.6 V DC |
| --- | --- |
| **Rated current** | 10 A |
| **Current consumption (no load)** | 20 mA |
| **Current consumption (power-saving mode)** | 130 µA |
| **Connectivity** | Bluetooth® 5.2 Low Energy |
| **Dimensions without magazine (length x height x width)** | 247 x 129 x 35 mm / 9.72 x 5.08 x 1.38 in |
| **Dimensions with 80-BB magazine (length x height x width)** | 247 x 188 x 35 mm / 9.72 x 7.40 x 1.38 in |
| **Weight without magazine** | 620 g |
| **Weight with 80-BB magazine** | 749 g |
| **Operating temperature range** | -15° C to +50° C |
| **Operating relative humidity** | ≤ 80% |
| **Operating pressure** | 60-140 PSI (compressed air only) |
| **Air consumption** | Approx. 1.5–2 PSI tank pressure drop per shot
The above value was measured under the following conditions:
- 2-stage regulator set to 100 PSI
- 48 ci / 0.8 L tank filled to 300 bar / 4500 PSI
- 0.20 g BBs, muzzle velocity approx. 330 FPS
- default FCU settings |
---
## Legal Notice
Please read this Legal Notice before operating your device and keep it for future reference. This document contains important terms and conditions regarding your device. By using this device, you agree to these terms and conditions.
## Disclaimer
GATE Enterprise sp. z o.o. sp. k. assumes no responsibility regarding compliance of the product with the requirements of any law, rule or airsoft restrictions pertaining thereto.
## Exclusion of Liability
GATE Enterprise sp. z o.o. sp. k. is not liable for any damages, injuries or accidents of any kind resulting from the use of this product or airsoft gun with the product installed, including (but not limited to) incidental or special damages to airsoft gun, airsoft gun parts and batteries.
## Intellectual Property
Intellectual Property owned by GATE Enterprise sp. z o.o. sp. k., including (but not limited to) devices, accessories, parts, software, documentation, is proprietary to GATE Enterprise sp. z o.o. sp. k. and protected under Polish laws, EU laws and international treaty provisions. You may not violate the rights of the Intellectual Property and you will not prepare derivative works of or reverse engineer the device or software. No ownership in the Intellectual Property is transferred to you.
## GATE Limited Warranty Policy
GATE Enterprise sp. z o.o. sp. k. warrants that its Product is free from manufacturing and material defects at the date of purchase and for a period of two (2) years from the date of purchase and it is nonextendable. This Limited Warranty is conditioned upon proper use of Product by Purchaser.
1. This Limited Warranty is valid provided that the owner provides a proof of purchase and properly completed warranty form.
2. This Limited Warranty does not cover: (a) defects or damage (e.g. mechanical, thermal or chemical) resulting from accident, misuse (misinterpretation of the instructions), abuse, neglect, unusual physical, electrical or electromechanical stress, water immersion, repairs or structural modification of any part of Product, or (b) the Product that has its serial number removed or made illegible; (c) defects or damage from improper operation, maintenance or installation, (d) installation of the products.
3. Requests for warranty are processed as soon as possible, not exceeding seven (7) working days. The company’s obligation under this Limited Warranty shall be limited to providing replacement of parts only.
The color of the product may vary slightly depending on the batch.
> ✅ **Note**
> ✅ The product warranty form is available here:[http://www.gatee.eu/warranty](http://www.gatee.eu/warranty) .
## Product Disposal Instructions
The symbol shown here means that the product is classified as Electrical or Electronic Equipment and should not be disposed with other household and commercial waste at the end of its working life. The Waste of Electrical and Electronic Equipment (WEEE Directive 2012/19/EU) has been put in place to recycle products using best available recovery and recycling techniques to minimize the impact on the environment. Purchasers shall take any old electrical equipment to waste recycling public centres or points of sale.
## Certifications and Regulations
### Attribution for Bluetooth®
The word mark and logo Bluetooth® are registered trademarks of Bluetooth® SIG, Inc., and their use by GATE Enterprise sp. z o.o. sp. k. is under license. Other trademarks and trade names belong to their respective owners.
## Product Compliance
### Declaration of Conformity
GATE Enterprise sp. z o.o. sp. k. hereby declares, on its sole responsibility, that the GATE ASTER II Bluetooth PTX® complies with the essential requirements of the following directives: 2014/53/EU and 2011/65/EU.
### Product Compliance for BGM220S Module
BGM220S modules have been tested for compliance with the relevant harmonized standards and meet the essential requirements and other relevant provisions of the Radio Equipment Directive (RED) (2014/53/EU).
This device complies with FCC e-CFR, Title 47, Part 15, Subpart C, Section 15.247 (and the relevant parts of ANSI C63.10-2013) when operated with the built-in antenna or the antenna types listed in section 11.1.1 Qualified Antennas. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Any changes or modifications not expressly approved by Silicon Labs could void the user’s authority to operate the equipment.
This radio transmitter (IC: 5123A-BGM220S for BGM220S12A and IC: 5123A-BGM220S2 for BGM220S22A) has been approved by Innovation, Science and Economic Development Canada (ISED Canada, formerly Industry Canada) for operation with the integrated antenna and the antenna types listed in section 11.1.1 Qualified Antennas, with the indicated maximum permitted gain. The use of any antenna not included in this list, or with a gain higher than the specified maximum, is strictly prohibited. This device complies with ISED’s license-exempt RSS standards. Operation is subject to the following two conditions:
1. This device may not cause interference; and
2. This device must accept any interference, including interference that may cause undesired operation.
** Contains a Radio Module**
Contient le module transmetteur: 5123A-BGM220S
This device operates on a secondary basis, and therefore must accept harmful interference, including interference from similar transmitters, and may not cause harmful interference to systems operating on a primary basis.
BGM220S22A modules are certified in Japan under certificate number 209-J00429.
BGM220S22A modules hold an RF certificate for import and use in South Korea. The certificate number is R-R-BGT-BGM220S2. BGM220S modules are supplied to the market as a pre-qualified Bluetooth Low Energy RF-PHY Tested Component, with Declaration ID D044526, QDID 155407, and a market introduction date of 2020-09-04.
## **Stay tuned with GATE**
[GATE HELP CENTER](https://help.gatee.eu/)
[http://www.gatee.eu/](http://www.gatee.eu/)
[Join the GATE Airsoft Community Discord Server!](https://discord.gatee.eu/)
[http://facebook.com/Gatee](http://facebook.com/Gatee)
[http://youtube.com/GateMovies](http://youtube.com/GateMovies)
[http://instagram.com/GateEnterprise](http://instagram.com/GateEnterprise)
Manufactured by GATE Enterprise sp. z o.o. sp. k.
Torowa 4
PL-30435 KRAKÓW
email: [support@gatee.eu](mailto:support@gatee.eu)
tel: +48 12 210 05 23
© 2026 GATE Enterprise sp. z o.o. sp. k