- Complete drop-in HPA engine
- Programmable FCU Included
- For Version 2 gearboxes
If you've decided to join the dark side and HPA your M4, this set will sort you out! The Storm Airsoft HP-R Storm System HPA Engine is a complete drop-in conversion kit for rear-wired version 2 gearboxes, packaged with everything you need to convert your AEG, bar the usual HPA regulator, airline and hose.
The included FCU offers a wide range of adjustable parameters, including programmable fire modes, rate of fire adjustment, and nozzle dwell time adjustment, ensuring reliable feeding with every shot. While it is a drop-in kit, this set will require a certain amount of familiarity with AEG internals and HPA. Luckily, Storm Airsoft provides a useful installation video which makes the process even easier.
Benefits of running HPA over a standard AEG gearbox include minimal FPS deviation between shots for improved accuracy, near-instantaneous trigger response for cranking out those double taps and a wide range of tuning options and adjustments, perfect for casual skirmishers looking to take their build to the next level. If you want the competitive edge HPA provides with minimal effort, the Storm Airsoft HP-R Storm System HPA Engine is the way to go!
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
A complete drop-in HPA conversion for rear-wired version 2 gearbox AEGs, the Storm Airsoft HP-R Storm System HPA Engine is one of the easiest ways on the market to take advantage of the inherent HPA performance advantages over standard AEGs. If you want a super-speedy trigger response, adjustable rate of fire and improved consistency and thus, accuracy, this is the way to do it!
Packaged with almost everything you'll need to complete the build, other than an HPA bottle, line and regulator, the HP-R engine is a single-solenoid setup that also requires an 11.1V LiPo battery to power the included Fire Control Unit (FCU). The FCU offers a wide range of programmable fire modes, including burst modes of various durations, binary trigger, and semi-auto only, ideal for any build objective, from a snappy CQB primary to beastly long-range DMR!
For more technical skirmishers, the FCU also offers rate of fire adjustment and nozzle dwell time adjustment, allowing you to crank up the rate of fire and ensure your nozzle timing is perfect for reliable feeding on a wide variety of magazines. Installation will require a certain amount of familiarity with AEG internals and HPA, though Storm Airsoft has done above and beyond to assist, providing both a detailed User Manual/Installation Guide and Installation Video to save you the headache!
Compatibility-wise, this engine is designed for rear-wired version 2 gearboxes, including those found in M4/AR-15, SMG-5 and G3 AEGs, but as any HPA tech will know, compact units like this can be stuffed almost anywhere with the appropriate expertise. The included wiring is set up for a Deans connector, but this can also be changed if you're handy with a soldering iron.
A considerably cheaper alternative to the Gate and Wolverine HPA engines, with a high-quality build, plenty of adjustable parameters and tuning options for the pros and top-tier HPA performance, the Storm Airsoft HP-R Storm System HPA Engine is a fantastic choice for performance-seeking skirmishers!
Features
- Complete drop-in HPA engine - Easy installation
- Adjustable nozzle length via shims - Ensure feeding is reliable with various HOP-up units
- Rear-wired setup - Deans connector pre-installed
- Digital FCU with LCD Screen - Program with ease!
- Programmable FCU Functions:
- Rate of fire adjustment
- Nozzle dwell time adjustment
- Programmable fire modes (either selector position)
- Semi automatic
- Binary trigger
- 2, 3, 4 or 5-round Burst
- Full automatic
- User manual/installation guide available here
- Installation guide video available here
- Requires an Airline, bottle and regulator
- 11.1V LiPo battery required to power the FCU - Recommended Battery: 11.1V 600mAh LiPo
- Compatible with most Version 2 gearboxes - Ideal for rear-wired M4, G3 & SMG-5 AEGs
Package Includes
- Storm Airsoft HP-R Storm System HPA Engine
- Nozzle shims x 4
- Air Hose
- Trigger Board plate
- Fire Control Unit (FCU)
- FCU to Trigger Board cable
- Trigger Board washer x 1
Specification
General
Parts & Accessories Type | Electric Internal Parts, Internal Parts, |
|---|---|
Internal Part Type | HPA Engine, Complete HPA Engine Conversion for V2 Gearbox, |
 | 11.1v LiPo required Custom Parts |
Part Specific
Part for Power Source Type | Electric |
|---|---|
Package Includes | Complete HPA Engine Conversion for V2 Gearbox |
Electric Part Specific
 | V2 Gearbox |
|---|---|
Gearbox Version Compatibility Variant | Version 2 |
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.