Complete Glock mag compatible 9mm or similar small frame Glock Pistol calibers- 40 Smith and Wesson, 357 Sig etc. AR15 lower receiver Uses OEM Glock or aftermarket magazines M4/M16 style fire control group pocket Type 3 Class II hard coat anodized - deep matte black Pictogram selector markings Extended length (for proper bolt catch overtravel) 9mm 8.4 oz buffer with carbine buffer spring KAK lower parts Model: KG15 Caliber: MULTI M4 stock and Grip Oversized integral trigger guard Last round bolt hold open Flared magazine well for faster & easier reloads Threaded Bolt Catch Screw Hole