Injection-moulded adapter enabling Hi-Capa pistols to use M4 AEG magazines with HPA systems.

Product Features:
• Durable injection-moulded polymer construction
• US-thread HPA fitting pre-installed for instant setup
• Integrated BB-retention system ensures consistent feeding
• Removable magwell and shim set for fine fitment
• Uses standard M4 AEG magazines for increased capacity
• Maintains consistent FPS and accuracy with no cooldown
• Performs reliably in cold or low-temperature environments

The AirTac HPA Adapter Hi-Capa to M4 allows Hi-Capa gas blowback pistols to run on high-pressure air while feeding from standard M4 AEG magazines. Its robust polymer body is injection-moulded for long-term durability and field stability, delivering a secure, precise fit to your pistol frame. The pre-installed US-thread connector provides a direct link to most HPA setups, while the built-in BB-retention system ensures seamless feeding under rapid-fire conditions and during reloads.

By switching to HPA, users eliminate the performance dips caused by gas cooldown, achieving consistent FPS and reliable accuracy from the first shot to the last. The use of M4 AEG magazines increases ammunition capacity dramatically, ideal for extended skirmishes or competitive play. Resistant to cold-weather performance loss, this adapter keeps your loadout operational year-round. Complete with all necessary fitment hardware, it’s a professional-grade enhancement for players seeking precision, consistency, and endurance from their sidearm system.