- HPA Conversion for AEGs
- Easy installation - Everything included
- For V2 (M4 / AR-15) or V3 (AK-47 / 74) gearboxes
If you're planning the move over to HPA to take your build to the next level, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit is a great way to do it! A drop in cylinder replacement single-solenoid HPA conversion kit, the JACK™ is available to fit either version 2 (M4/AR-15) or version 3 (AK-47/74) gearboxes, including everything you need other than your airline, regulator, air bottle and FCU battery.
Capable of a stunning 30 rounds per second in most setups, with more air volume and a wider range of velocity adjustment than its rivals, the JACK™ is highly efficient with a stunning response rate and a vast range of programmable customisation options built into the included fire control unit (FCU). If you're a performance seeker, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit will change your game!
Fast Delivery
Delivery & Postage
Here at Patrol Base, we send all our packages from our Warehouse based in the UK with the exception of European Warehouse Items. All of our parcels are sent with specially picked couriers to ensure your parcels get to you on time and in one piece.
For more information please check out our Delivery Information Page.
Estimates
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK 3-5 day Standard
£6.95
From
Dispatched with 24hr UK mainland
£8.95
From
Highlands / Islands
£24.99*
From
* Please note that Scottish Highlands, and Islands postage prices can vary wildly. Please refer to the Postage Calculator at the basket for the lowest possible price.
Returns
We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
Description
If you're looking to step up your Airsoft gameplay, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit is the key! This single-solenoid HPA conversion set is a drop-in replacement for the cylinder group, available in either V2 (M4/AR-15) or V3 (AK-47/74) gearbox flavours. The set includes everything you need to complete the conversion, though you'll need a battery for the fire control unit along with the standard HPA airline, bottle and regulator to get busy in-game.
The included digital FCU can be programmed for various fire mode settings and tuning options, including burst modes, anti-stiction mode, rate of fire adjustment and semi-auto limiter, to name but a few. Programming is super easy thanks to the built-in LCD screen and joystick, allowing you to adjust on the fly in seconds, should the need arise.
The JACK™ engine itself uses a proven "open bolt" design with a blow-forward mechanism to cycle the one-piece delrin nozzle. The nozzle is the only moving part in the system, equipped with an integral hybrid spool/poppet valve, providing outstanding air-efficiency, high air volume and consistent performance with every shot.
As an example, the JACK™ hits out at an incredible 500 FPS using 0.20g BBs with a mere 130 PSI input (tested with a 6.05 x 375mm inner barrel); far more efficient than rival engines, which results in more shots per tank fill, allowing you to stay in the game for longer.
Compatibility-wise, the JACK™ can be installed in a wide variety of platforms with the correct nozzle and the right expertise. By default, the version 2 gearbox variant is set up for M4/AR-15s and AR-9s, while the version 3 variant is equipped with the necessary parts for installation in AK-47/74 AEGs. If you need a world-beating primary without spending too much time fiddling, the PolarStar JACK™ HPA Engine Conversion Kit will do the trick!
Features
- HPA Conversion for AEGs - V2 for M4/AR-15 & AR-9, V3 for AK-47/74
- Easy installation - Includes everything needed to install
- Single solenoid HPA engine - Keep things simple!
- Replaces the cylinder group - Drop-in installation
- Modular nozzle system - Switch the nozzle to install the JACK™ in different platforms
- Digital FCU with LCD Screen & joystick - Easy to program and check settings
- Up to 30 rounds per second RoF - Impressive speed possible in most internal setups
- 500 FPS on 0.20g BBs @ 130PSI - More airflow than equivalent HPA engine conversions
- Air Efficiency: 1000+ shots from 13/3000 @ 1.5J w/ .28g (source: PolarStar Airsoft testing)
- Adjustable velocity - Adjust FPS by altering input PSI on your regulator, range: 280-500 FPS on 0.20g BBs
- Programmable fire modes via the included FCU:
- Semi auto
- Full auto
- 2-9 round burst
- For Version 2 gearbox (M4/AR-15) or Version 3 gearbox (AK-47/74) - Choose your variant
- HPA Bottle, airline, FCU battery & regulator required
Package Includes
- PolarStar Airsoft JACK™ HPA Engine Conversion Kit
- Fire Control Unit (FCU)
- Wiring harness
- Switchboard
- Filter fitting
- Screws & washers
Specification
General
Parts & Accessories Type | Electric Internal Parts |
|---|---|
Internal Part Type | Complete HPA Engine Conversion, HPA Engine, |
 | Custom Parts |
Name Variant | For Version 2 Gearbox (M4/AR-15), For Version 3 Gearbox (AK-47/74), |
Construction
 | Black |
|---|---|
 | Aluminium, brass & steel |
Internal Part Construction | Steel, Aluminium, |
Part Specific
Part for Power Source Type | Electric |
|---|---|
Package Includes | HPA Engine |
Electric Part Specific
 |
|
|---|---|
Gearbox Version Compatibility Variant | Version 2, Version 3, |
Size guide
Parts Fitting
Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff.
Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.
We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!
Unique Parts
Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.
Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.
If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.
For more information with fitting parts, or should you require help, feel free to get in touch with our Workshop Department via our Contact Us Page.
Terms and Conditions relating to parts fitting can be read on our Terms and Conditions Page.