

- Polycarbonate construction
- For most Hi-Capa GBB Pistols
- Fits standard M4/AR-15 AEG magazines
If you want a side of speed with your Hi-Capa build, the Airtac HPA Mag Adapter for M4/AR-15 AEG Magazines; Hi-Capa is a fantastic way to do it! Made from an injection-moulded polycarbonate blend, this adapter is designed to mount to a stripped-down Hi-Capa GBB magazine and allow your pistol to feed from M4/AR-15 AEG magazines and be fuelled by High Pressure Air (HPA).
The advantages of using HPA when performance is concerned include the elimination of FPS fluctuation due to the "cooldown" effect, resulting in improved shot-to-shot consistency and improved accuracy down range, especially under rapid fire. With this adapter on board, you also get a considerable capacity boost, putting your 'Capa toe-to-toe with rifles in terms of fire supremacy on the field. If you ever wanted a pistol which shoots like a rifle, the Airtac HPA Mag Adapter for M4/AR-15 AEG Magazines; Hi-Capa is essential!
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
The Airtac HPA Mag Adapter for M4/AR-15 AEG Magazines; Hi-Capa is designed to work with most Hi-Capa GBB pistols, allowing them to feed from standard M4/AR-15 AEG magazines using High Pressure Air (HPA) as a power source. Naturally, you'll need an HPA bottle, line and regulator to use this, and the set includes a US spec connector. Once set up, there are few platforms out there that can contend with an HPA-fuelled 'Capa!
The Airtac adapter features an innovative BB retention mechanism, meaning you only lose 3 BBs during a magazine change; far fewer than equivalent adapters. This adapter also includes a single-stack feed channel, designed to prevent jams and improve reliability, especially when used with super-strong EPM-1RX magazines. The magazine well itself also includes a removable flare, designed to guide your magazine in smoothly during a reload, a more forgiving design ideal for adrenaline-pumped action.
This magazine adapter requires assembly and a donor Hi-Capa green gas magazine. Airtac recommends Tokyo Marui, WE, Novritsch, Raven or VORSK magazines for ease of installation. M4 magazine-wise, Airtac recommends using PTS-branded magazines but states most M4 AEG magazines will work. The set also includes rear shims designed to fit the rear of the M4 magazine well to ensure feeding is reliable with a wide variety of M4 AEG mags.
HPA use comes with more than a few advantages, including the elimination of FPS fluctuation due to the "cooldown" effect, improved shot-to-shot consistency and improved accuracy down range, especially under rapid fire. When set up, this HPA adapter will considerably improve consistency, and feeding from M4/AR-15 AEG mags means you get more capacity too!
A factor to consider if you're moving over to HPA is additional parts wear from doing a lot more shooting than you usually would with a pistol. This can shorten the lifespan of gas pistols that haven't been upgraded with HPA use in mind; as such, we only recommend this adapter for those who are prepared for potential parts replacement down the line. Remember, the candle that burns twice as bright burns for half as long!
Packed with innovative features not present in other adapters at a price point which is hard to believe, the Airtac HPA Mag Adapter for M4/AR-15 AEG Magazines; Hi-Capa is a great alternative to pre-built adapters for the technically minded performance seeker. If this sounds like you, Airtac is about to change your game!
Features
- Injection moulded Polycarbonate blend - Strong & light
- Assembly required - Requires a donor green gas Hi-Capa mag, care & expertise
- Magazine release on the left side - Ideal for "strip 'n' rip" reloads
- Takes standard M4/AR-15 AEG magazines - Extra capacity = more kills!
- Single-stack design - Ensures feeding is reliable with strong mag springs and high RoF
- BB Retention mechanism - Only 3 BBs lost during mag change, far less than most HPA adapters
- The slide lock function won't function as intended when installed - Can be locked back manually
- Compatible with most Hi-Capa GBB Pistols - Modification may be required
- US HPA connector pre-installed - Requires a US-type line/bottle/regulator
- Requires a TM, WE, Novritsch, Raven or VORSK Hi-Capa magazine
- HPA Bottle, Airline & Regulator required (NOT included)
Package Includes
- Airtac HPA Mag Adapter for M4/AR-15 AEG Magazines; Hi-Capa
Special Instructions
Early Tokyo Marui magazines which use pins instead of screws to connect the baseplate are NOT compatible with this adapter. Late generation magazines which use screws are good to go.
Specification
General
Parts & Accessories Type | Magazine Adaptor |
|---|---|
Item Colour | Black |
Construction | Injection moulded polycarbonate blend. |
Weight (KG) | Approx.0.078KG |
Magazine Specific
Magazine Style | Hi-Capa |
|---|---|
Platform Type | Pistol |
Platform | Hi-Capa |
Magazine Type | HPA Magazine Adapter |
Warnings | Lubrication is required |
|---|



