This valve is for installation into the RWA Nighthawk/SPS/ KWC 1911 gas blowbacks that use the System 7 technology. It allows more reliable shot-to-shot power (FPS) and reduces your FPS down to a stable 290 - 310 fps which is more CQB friendly.
Elite Force 1911A1 / Elite Force 1911 Tac
RWA SPS Falcon / RWA Nighthawk
KWC Licensed Colt M1911 WWII / KWC BLACKWATER R2
KWC COLT 1911 Rail Gun (Black, Stainless. Dual Tone, M45A1)