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AirTac HPA Adapter — Hi-Capa to M4 Magazine

AirTac HPA Adapter — Hi-Capa to M4 Magazine

£39.95
£39.95
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DETAILS

SKU: 35946627
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💨 AirTac's entry-point Hi-Capa HPA adapter — lifetime warranty included. Converts your Hi-Capa GBB to run on HPA with M4 AEG magazines. Clean plug-and-play installation, injection-moulded polymer body engineered for consistent alignment, US Foster HPA fitting as standard. At £39.95, this is the most accessible route to HPA performance on a Hi-Capa platform.

HPA adapters give Hi-Capa players what gas magazines fundamentally cannot: shot-to-shot FPS consistency regardless of temperature, effectively unlimited capacity through standard M4 magazines, and the ability to dial in your output pressure precisely for any site limit. The AirTac Hi-Capa to M4 adapter is designed as a clean, no-fuss entry into this — slot it into your Hi-Capa magwell, connect your HPA line, load an M4 magazine, and you have a properly HPA-fed pistol.

AirTac's injection-moulded polymer body is designed for stable fitment and consistent alignment between pistol, adapter, and magazine during active use — a detail that matters for reliable feeding and air seal. This isn't an afterthought on construction; misalignment between the adapter body and the pistol nozzle is one of the most common causes of poor performance with budget HPA adapters. The US Foster fitting is the industry standard for airsoft HPA, compatible with all mainstream HPA lines and regulators.

Every AirTac adapter comes with a lifetime warranty — a genuine commitment from a company that manufactures its own products and backs them with spare parts support.

What you need to run this adapter

Item Notes
HPA tank Any paintball/airsoft HPA tank — see HPA Tanks
Secondary regulator AirTac AT200 or equivalent — always required; never connect direct to tank regulator alone
HPA line US Foster fitting line — see HPA Lines
M4 AEG magazine PTS EPM/EPM1 recommended; strong spring essential

Specifications

Specification Detail
Body material Injection-moulded polymer
HPA fitting US Foster (standard airsoft fitting)
Recommended operating pressure ~120psi (green gas equivalent); max 140psi
Compatible platforms Hi-Capa GBB pistols (WE, TM, SSP5 and compatible variants)
Magazine compatibility Standard M4 AEG magazines
Warranty Lifetime warranty (AirTac)

Package Contents

Item Qty
AirTac Hi-Capa to M4 HPA Adapter 1

Usage Tips

Set your secondary regulator to approximately 120psi to replicate green gas operating conditions on your Hi-Capa's internals. This is the correct starting pressure — adjust up or down slightly to reach your desired FPS on chrono. Never exceed 140psi; beyond this pressure, internal wear on nozzles, O-rings, and hop-up rubbers accelerates significantly. Always rack the slide before inserting the adapter to bring the nozzle forward into the sealing position. Use high-quality M4 magazines with strong springs — the magazine spring is responsible for pushing BBs up into the adapter's feed system, and a weak spring is the most common cause of double-feeds or misfeeds.

🔧 Titan Forge Airsoft tip: This is the most affordable route to HPA performance on a Hi-Capa at £39.95. If you want the additional build quality of a CNC alloy mag release and a heavier glass-nylon body, the CTM Hi-Capa adapter at £55.00 is the premium alternative. For a full HPA pistol starter setup — tank, regulator, line, and adapter — call us on 01494 911990 and we can put together the right combination for your budget.