Product Description Specifications Brand: Lancer Tactical Construction: CNC machined metal Compatibility: Fits most M4 magazines but not all to a AAP01 pistol format Color: Black Features Durable metal construction Steel output valve Comes with EU/US version input adaptor (5mm screw thread) 6061 aluminium CNC adaptor casing & AEG magazine catch Magwell friendly design Adjustable screw for fitting various kinds of AR-15 AEG magazines Loading tube window WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov/product Customer Reviews