Connect the engine to the chamber
The QD connection aligns the nozzle with the hop-up chamber. Its factory-matched length places the BB correctly in the bucking.
HUSAR for V2 GB
1 / 5
Select a thumbnail or swipe. Click to enlarge. The barrel shown in the visuals is not included.
GATE / HUSAR FOR V2 GB
HUSAR. Sniper-level accuracy.
In your assault rifle or DMR.
Engine + chamber. One integrated HPA system. The world’s only HPA engine compatible with GBB/VSR buckings, available for V2 and V3 gearboxes. EON VSR chamber and VSR bucking included. A matched nozzle and shared alignment simplify installation. Choose a VSR barrel separately.
Engine + chamber + ASTER II included
EUR 335,16
Tax included. Shipping calculated at checkout.
Planned dispatch: second half of December 2026 / January 2027.
Save 30% for 7 days only: 30 Oct–5 Nov 2026, until 23:59 CET.
1. Gearbox
Every configuration includes the HUSAR engine and an EON VSR hop-up chamber. V2 and V3 versions differ in their included chamber; sets with electronics also include ASTER II Bluetooth® for your gearbox.
2. Set configuration
Engine + chamber + ASTER II included: HUSAR, EON VSR hop-up chamber for V2, ASTER II Bluetooth® for V2 GB, Quantum Trigger 2 and Maple Leaf AUTOBOT 60° hop-up bucking (rubber version). Front-wired.
01 / QDDrop-in. Skip the tedious alignment.
02 / FREEFLOATEngine, chamber and barrel. One axis.
03 / VSR · GBBGBB/VSR buckings in V2 and V3.
FREEFLOAT / DROP-IN INSTALLATION
Aligned by design.
Less time on the workbench.
HUSAR is a fully drop-in engine for your chosen V2 or V3 platform. Connect it to the hop-up chamber, and clearance around the engine body lets it stay aligned with the barrel. There is no tedious engine alignment or trial and error with nozzle lengths. The nozzle is matched to the chamber at the factory to seat each BB precisely in the hop-up bucking.
Leave clearance inside the gearbox
Mounting clearance around the engine body prevents the gearbox from forcing it out of alignment.
The engine follows the barrel
Within this clearance, the engine, chamber and barrel stay on one axis, even when the upper and lower are not perfectly aligned.
GBB/VSR STANDARD FOR V2 AND V3 PLATFORMS
Built for accuracy.
Designed as one system.
The world’s only HPA engine compatible with GBB/VSR buckings, available for V2 and V3 gearboxes. HUSAR brings the bucking standard known from precision sniper builds to your assault rifle or DMR. The engine, EON VSR chamber and factory-matched nozzle form one integrated assembly. Chamber and VSR bucking included; choose a VSR barrel separately.
Sniper-level accuracy
GBB/VSR bucking compatibility in V2 and V3 gearboxes. Extended nozzle travel and TDC adjustment bring this standard’s potential to your assault rifle or DMR.
Fully drop-in
No tedious engine alignment or nozzle-length selection. The matched engine and chamber stay aligned, while mounting clearance reduces the influence of gearbox and receiver fit.
Every engine tested
Every HUSAR goes to our shooting range. Recorded impacts let us check accuracy and grouping.
Lower air consumption
We improved air consumption compared with PULSAR S2 V31 to get more from the air in your tank.
FREEFLOAT / ONE SHARED AXIS
GBB/VSR / EXTENDED NOZZLE TRAVEL
Precision that delivers.
From the first shot.
Extended nozzle travel enables HUSAR to work with GBB/VSR buckings in V2 and V3 gearboxes. A factory-matched nozzle length positions the BB correctly in the bucking. The engine and chamber are designed as one system to deliver consistent performance from the first shot.
Choose the bucking profile and hardness to suit your BB weight and setup. The lightweight POM nozzle operates with low friction and resists wear.
Black POM nozzleVSR / GBBExtended nozzle travel
GATE R&D / FROM PTX TO HUSAR
Precision developed
on the range.
HUSAR builds on the experience gained developing PULSAR S2 for PTX, through a programme of more than 47,000 shots. In comparable GATE R&D tests at 40 m, the move from V22 to V31 reduced average MOA by 53.9%. The best 50-shot group achieved 25.32 MOA and a SCORE of 87 with a barrel just 138 mm long.
We brought that experience into HUSAR: an HPA engine engineered for exceptional accuracy. The engine and included EON VSR hop-up chamber work together as one matched system.
- Development programme
- 47,205shots fired, based on ETU counters
- Average MOA
- −53.9%V22 → V31 / comparable testing at 40 m
- Best 50-shot group
- 25.32 MOASCORE 87 / 138 mm barrel / 40 m range
IMPACT TELEMETRY / GATE R&DEnlarge map
47,205 shots is the development programme total based on ETU counters. The MOA comparison refers to V22 → V31 testing. The comparative diagrams in the graphic are illustrative.
QUALITY CONTROL / GATE SHOOTING RANGE
Every engine.
Tested on our range.
Every HUSAR we manufacture undergoes an individual accuracy test on our 40 m shooting range. An electronic measurement system records impact coordinates, allowing us to assess the grouping of each unit.
Inspection also covers startup at low and high pressure and FPS consistency. Only units that meet GATE’s quality standards are cleared for dispatch.
100%of HUSAR engines tested for accuracy
ACCURACY TESTING / GATE SHOOTING RANGETesting distance / 40 m
Individual testing
Every engine undergoes its own range test at a distance of 40 metres.
Electronic impact measurement
The system records the X and Y coordinates of each detected BB to assess grouping precisely.
GATE quality standards
Test results determine whether a unit is cleared for dispatch. Only units that meet our standards are shipped.
GATE EON VSR HOP-UP CHAMBERS
GBB/VSR buckings.
Now in your V2 or V3.
HUSAR brings the bucking technology used in precision airsoft sniper rifles to your assault rifle or DMR. The EON VSR chamber builds on GATE EON design, supporting GBB/VSR buckings and VSR barrels with precise TDC adjustment.
The engine, chamber and extended-travel nozzle are designed to work together. The factory-matched nozzle seats the BB in the bucking, while TDC precisely adjusts hop-up pressure. QD and freefloat help keep the engine, chamber and barrel aligned. The chamber and VSR bucking are included; the VSR barrel is sold separately.
CNC precision. Repeatable adjustment.
Accurate machining and close fits stabilize the barrel and bucking. The POM clip limits barrel rotation, while TDC guidance keeps the nub level. Tune the hop to your BBs and focus on the game.
CNC-machined aluminium body for precise construction and stable component positioning.
TDC adjustment applies vertical, centred pressure to the hop-up bucking.
POM anti-rotation barrel clip keeps the barrel correctly positioned.
Clear numbering and an easy-to-use wheel help you tune hop-up to your BB weight.
Illustrative V2 chamber cutaway. Hop adjustment components are highlighted.
TDC IN ACTION
Top-down pressure.
Precise hop-up adjustment.
TDC guides the nub vertically, centred over the barrel axis. Pressure changes while the nub stays level. Even contact between bucking and BB helps produce consistent hop and straight flight.
Turn the adjustment wheel
Adjust hop pressure to suit your BB weight and replica setup.
The nub moves vertically
TDC guidance keeps pressure centred without tilting the nub sideways.
The bucking applies backspin
The VSR bucking works through the barrel window and gives the BB the backspin that produces its flat trajectory.
Hop-up chamber and VSR bucking included
Your HUSAR engine comes with a matched EON VSR hop-up chamber and a Maple Leaf AUTOBOT 60° hop-up bucking (rubber version). The chamber is included in every configuration, including versions without control electronics. Choose the version for your V2 or V3 gearbox.
Choose a VSR barrel
A barrel is not included. A standard AEG barrel does not fit the EON VSR chamber — you need a VSR-standard barrel.
QD CONNECTION TO THE HOP-UP CHAMBER
Retract the collar.
Disconnect the chamber.
The QD connection positions the engine and hop-up chamber relative to each other and keeps the nozzle aligned with the chamber. Freefloat mounting clearance reduces the influence of gearbox and receiver misalignment on the matched assembly.
Retract the QD collar towards the engine rear to release the lock. Then withdraw the hop-up chamber along the shared axis. To reassemble, insert the chamber and return the collar to the locked position.
Retract the collar · Slide the chamber out on axisOPEN-BOLT / SINGLE SOLENOID
One solenoid.
Accuracy and speed.
The HUSAR engine, chamber and barrel share one axis. A factory-matched nozzle length seats the BB correctly in the VSR bucking. One solenoid controls BB feeding and firing in the open-bolt cycle.
The first shot fires a BB, without an empty starting cycle. The short cycle supports up to 50 BBs per second with suitable electronics settings, HPA supply and magazine feeding performance.
OPEN-BOLT
Accuracy through matched mechanics
Shared alignment, a matched nozzle length and a VSR bucking help deliver consistent BB feeding and tight groups.
FIRST SHOT
A BB on the very first shot
The first trigger pull fires a BB, without an empty cycle to get the engine ready.
UP TO 50 BB/s
Speed when you need it
Up to 50 BBs per second with suitable electronics settings, HPA supply and magazine feeding performance.
Feed a BB. Fire. One cycle.
One solenoid controls BB feeding and firing in open-bolt operation. Adjust engine timing and rate of fire using compatible control electronics.
Actual rate of fire also depends on electronics settings, pressure and the magazine's ability to feed BBs.Get more from your air tank.
HUSAR uses air more efficiently than PULSAR S2 V31. GCS and autocalibration with SOL help you tune engine timing to your setup.
Explore autocalibrationEvery part has its place.
Threaded housing sections form a compact assembly. The animation shows them unscrewing and the rear valve assembly separating.
This animation explains the construction. Follow the product manual for servicing.GATE TECHNOLOGY
patent pendingTechnology developed
with PTX.
While developing PTX, we created our own technology that integrates the HPA engine and hop-up chamber into one precisely matched assembly. HUSAR builds on this idea: the engine, nozzle and chamber share a common axis.
In the filed design, the nozzle first loads the BB and seals against the hop-up bucking. Only then is air released to propel the BB. This sequence supports consistent operation.
Consistent shots
A shared axis and controlled BB loading help the hop-up work consistently.
Less fitting work
Alignment and nozzle length are set by the design, simplifying installation.
Compact construction
The HPA engine and hop-up chamber form one integrated system.
GATE patent applications
- Poland
- P.453823
- EPO
- EP26165635.9
- USA
- 19/686,674
CONTROL / ASTER II BLUETOOTH®
Trigger and fire modes.
Under your control.
In HUSAR sets with ASTER II Bluetooth®, the electronics control firing and engine operation. Connect to GCS to tune trigger response, fire modes and HPA settings to your replica.
Trigger sensitivity
Set the optical trigger sensor's activation point and adjust sensitivity to your play style.
Fire modes
Configure selector behaviour, semi-auto, bursts and other modes supported by your ETU.
Rate of fire
Set a firing rate suited to your replica and magazine feeding performance.
HPA settings
Adjust solenoid timing and cycle settings in a compatible HPA mode.
Choose ASTER II for your V2 or V3 gearbox. HUSAR versions without control electronics require separate electronics. Available functions depend on the ETU version, firmware and HPA configuration.
GATE CONTROL STATION / FREE APP
Tune your replica.
In the GCS app.
GATE Control Station brings settings for your electronics and supported GATE devices into one app. ASTER II Bluetooth® connects directly over Bluetooth — no USB-Link or Blu-Link needed.
Configure
Adjust trigger sensitivity, selector modes, rate of fire and available HPA engine settings.
Update
Install ETU firmware updates, fixes and supported new functions through the app.
Diagnose
Check device messages, available statistics and telemetry. Run diagnostics and send a report to GATE support when needed.
Android · iOS · Windows · macOS
Available settings and readings depend on the connected ETU, firmware and operating mode. AEG mechanism functions do not apply to an HPA engine.
HUSAR + SOL + GCS / AUTOMATIC HPA CALIBRATION
HUSAR autocalibration.
With SOL and GCS.
Connect SOL measurements with a compatible GATE ETU and start calibration in GCS. The app guides you through the process while the electronics select engine timing from the measured shots.
Explore autocalibration with SOL ↗SOLTRACER / FLAMER / CHRONOGRAPH
- 01GCS
Start the procedure.
Start HPA autocalibration in the app and follow the instructions.
- 02SOL
Fire the requested shots.
SOL measures muzzle velocity and supplies the readings needed for calibration.
- 03ETU
The ETU selects the timing.
Compatible electronics automatically adjust solenoid timing for the single-solenoid HUSAR engine.
Adjust pressure manually on your regulator.
Autocalibration selects engine timing. Adjust pressure following the guidance in GCS.
Requires SOL, GCS and a compatible ASTER II Bluetooth® (V2 / V3) or TITAN II Bluetooth® (V2), with firmware supporting HPA autocalibration. SOL is sold separately.
SOL is also a tracer, multicolour flamer and chronograph. With a compatible ETU, it also supports dry-shot detection and warnings when your set FPS limit is exceeded.
View SOL ↗GET CLOSER TO HUSAR
Refined
in every detail.
The same HUSAR engine works with a hop-up chamber for V2 or V3. Choose the chamber that fits your replica.
V2 and V3 versions differ in their hop-up chamber; the HUSAR engine itself is the same. Electronics depend on your chosen configuration. A VSR hop-up bucking is included. A VSR barrel must be purchased separately. Barrels in the visuals illustrate how the assembly works.
FIVE CONFIGURATIONS. ONE HUSAR SYSTEM.
Your gearbox.
Your setup.
Every configuration includes the HUSAR engine, an EON VSR hop-up chamber for your chosen V2 or V3 gearbox, and a VSR bucking. Sets with electronics include the engine + chamber + ASTER II. Purchase a VSR barrel separately — a standard AEG barrel does not fit this chamber.
| Configuration | Included electronics | ETU wiring | Price |
|---|---|---|---|
| V2 · With ASTER II · rear-wired | ASTER II Bluetooth® | Rear-wired | EUR 335,16 |
| V2 · With ASTER II · front-wired | ASTER II Bluetooth® | Front-wired | EUR 335,16 |
| V3 · With ASTER II Bluetooth® | ASTER II Bluetooth® | V3 version | EUR 335,16 |
| V2 · Without ETU / FCU | Without ETU / FCU | Depends on your chosen ETU | EUR 251,16 |
| V3 · Without FCU | Without ETU / FCU | Depends on your chosen ETU | EUR 251,16 |
TECHNICAL SPECIFICATIONS
Designed around
a shared axis.
- Construction
- Set: single-solenoid electropneumatic HPA engine + included EON VSR hop-up chamber
- Operating mode
- Open-bolt
- Operating pressure
- 60–140 PSI
- Adjustable rate of fire
- 1–50 RPS (rounds per second)
- Air supply
- Compressed air (HPA) only
- Solenoid voltage
- 5–8.4 V DC
- Operating temperature
- −15 to +50°C
- Operating relative humidity
- ≤ 80%
- Alignment
- Direct QD connection to the hop-up chamber; freefloat design
- Installation
- Drop-in engine for your chosen V2 / V3 platform; requires a suitable VSR barrel
- Gearbox versions
- V2 / V3 — same engine, different hop-up chambers
- Hop-up chamber
- Included: GATE EON VSR — CNC-machined aluminium body; V2 or V3 gearbox version
- Hop-up adjustment
- TDC — vertical, centred nub pressure; numbered adjustment wheel
- Nozzle
- Black, lightweight POM nozzle; length factory-matched to the hop-up chamber
- Hop-up buckings
- Included: Maple Leaf AUTOBOT 60° hop-up bucking (rubber version). The system supports GBB/VSR buckings.
- Barrel — not included
- VSR barrel required, sold separately. Standard AEG barrels do not fit the chamber.
- Factory accuracy testing
- Every engine individually tested; impact coordinates measured at the GATE shooting range
- Air consumption
- Optimized compared with PULSAR S2 V31
- Finish
- Black engine housing and hop-up chamber; green QD collar and hop-up adjustment wheel; white HUSAR markings
BEFORE YOU CHOOSE
Good to know.
Drop-in installation, accuracy, quality control and choosing a complete setup.
How does HUSAR's freefloat design work?
The engine connects directly to the hop-up chamber, with mounting clearance around its body inside the gearbox. Within this clearance, the gearbox and lower receiver do not force the engine, chamber and barrel out of their shared alignment.
Which barrel do I need for HUSAR?
You need a VSR-standard barrel. A barrel is not included with HUSAR and must be purchased separately. A standard AEG barrel does not fit the VSR chamber.
What is the difference between V2 and V3?
Every version includes the HUSAR engine and a matched EON VSR hop-up chamber. The engine is the same, while the included chamber fits your V2 or V3 platform. Sets with electronics include the engine + chamber + ASTER II. V2 ASTER II sets are available with front or rear wiring. Versions without an ETU / FCU also include the hop-up chamber.
Which hop-up buckings does HUSAR support?
A Maple Leaf AUTOBOT 60° hop-up bucking (rubber version) is included. Extended nozzle travel supports GBB/VSR buckings. If you change the bucking, choose a profile and hardness suited to your BBs and setup.
How do I release the QD connection?
Retract the QD collar towards the engine rear to release the lock. Then withdraw the hop-up chamber along the shared axis. To reassemble, insert the chamber and return the collar to the locked position. The engine body sections use a separate threaded joint.
Can the version without control electronics operate on its own?
No. You need compatible control electronics — an ETU / FCU suitable for your platform — and an HPA supply. The version without electronics still includes the engine, EON VSR hop-up chamber and a VSR bucking. Contact GATE if you need help choosing compatible control electronics.
Does autocalibration with SOL adjust the pressure?
You adjust pressure manually on the regulator, following GCS guidance. During autocalibration, SOL measures BB velocity and a compatible ETU automatically selects engine timing. You need SOL, GCS and electronics that support this function.
Do I need an extra adapter to connect to GCS?
ASTER II Bluetooth® connects directly to GCS using built-in Bluetooth. No USB-Link or Blu-Link is required for this connection. Available app functions depend on the connected ETU and its firmware.
Is HUSAR fully drop-in?
Yes — the engine is drop-in for your chosen V2 or V3 platform. It connects directly to the hop-up chamber, and the freefloat design provides clearance inside the gearbox. This removes tedious engine alignment and nozzle-length selection. The nozzle is factory-matched to the chamber and seats the BB precisely in the bucking. Purchase a VSR barrel separately; a standard AEG barrel does not fit this chamber. Choose compatible control electronics and an HPA supply. After installation, tune hop-up and engine timing, then check muzzle energy with a chronograph.
Is every engine tested for accuracy?
Yes. Every engine undergoes its own accuracy test at the GATE shooting range. The system records impact positions, and the engine must meet our grouping criteria.
What do VSR buckings and extended nozzle travel offer?
Extended nozzle travel allows proper GBB/VSR bucking operation in an engine for V2 and V3 gearboxes. Together with the shared alignment of the engine, chamber and barrel, this delivers exceptional accuracy and a flat BB trajectory. Match your bucking profile and hardness to your BB weight and setup.
Is HUSAR air-efficient?
Yes. We improved air consumption compared with PULSAR S2 V31. The number of shots from a tank also depends on tank size and fill, pressure, engine timing, barrel, BBs and muzzle energy.
Why does HUSAR use one solenoid rather than two?
One solenoid controls BB feeding and firing throughout the open-bolt cycle. Shared engine, chamber and barrel alignment, a factory-matched nozzle length and a VSR bucking keep the components matched. The first shot fires a BB without an empty starting cycle. Up to 50 BBs per second requires suitable electronics settings, HPA supply and magazine feeding performance.
What does HUSAR 2-in-1 mean?
2-in-1 means an HPA engine and a matched EON VSR hop-up chamber in one set. Every V2 and V3 configuration includes the chamber and VSR bucking, including versions without electronics. ASTER II configurations also include the control unit specified in the product name. A VSR barrel is sold separately.
GATE / HUSAR
HUSAR. Sniper-level accuracy.
Your assault rifle. Your DMR.
The world’s only HPA engine compatible with GBB/VSR buckings, available for V2 and V3 gearboxes. Engine + EON VSR chamber included. Choose V2 or V3, with ASTER II Bluetooth® or without control electronics. Every unit tested at the GATE range at 40 m.