EPES HPA Adapter MK2 – Foster QD Coupling

The EPES HPA Adapter MK2 is a refined second-generation HPA interface engineered for serious pistol upgrades. Whether you’re running a support role in milsim events or optimising performance at your local site, this adapter opens the door to stable, weather-independent gas performance.

Key Features

• Foster US quick-disconnect (QD) coupling – industry-standard, reliable connectivity
• Blackened stainless steel – corrosion-resistant and professional finish
• Second-generation design – refined tolerances over the original MK1
• Broad platform compatibility – works with WE, KJW, GHK, and VFC platforms
• Drop-in installation – no permanent modification required

Real-World Use Cases

HPA adapters are essential for players seeking consistency in variable UK weather. Cold weather causes green gas pressure to drop, reducing range and accuracy; HPA systems maintain a flat velocity curve from winter skirmishes to summer ops. Milsim players benefit from extended game duration without velocity creep, whilst speedsofters appreciate the reliability during rapid-fire sessions.

Technical Specifications

• Construction: Stainless steel, blackened finish
• Coupling Type: Foster US quick-disconnect
• Compatibility: WE, KJW, GHK, VFC gas blowback pistols
• Generation: MK2 (improved over original design)

Compatibility & Upgrades

This adapter pairs with any standard HPA regulator featuring a Foster US QD female connector. Popular options include Amped Airsoft, Ninja, and Redline regulator systems. Ensure your chosen regulator outputs in the 0.5–2.0 bar range for pistol application; higher pressures will damage valves. The blackened finish resists cosmetic wear during field use, maintaining professional appearance across seasons.

UK Legal & Site Notes

HPA systems are legal throughout the UK, provided your pistol remains within site FPS limits (typically 340–380 fps at 0.20g for pistols). Always chronograph after installation and inform your site organiser before play. The Foster coupling allows field-safe disconnection without full disassembly, improving changeover speed between games.

Upgrade your pistol reliability with the EPES HPA Adapter MK2 and experience consistent performance whatever the season. Shop now at Airsoftdirect to secure yours.