The AR-15 9MM Conversion Adapter enables seamless conversion of your AR-15 platform to accept 9mm ammunition using popular pistol magazines from S&W M&P and SIG 320 series firearms.AR-15 9MM Conversion AdapterCompatible with Smith & Wesson M&P magazine systemsCompatible with SIG Sauer P320 magazine systemsConverts AR-15 platform for 9mm ammunition useReliable magazine interface and feeding systemPerfect for shooters looking to utilize existing pistol magazines in their AR-15 build or convert to more affordable 9mm ammunition while maintaining the familiar AR-15 platform ergonomics and controls.