Used Colt style 9mm parts: 2.75' 1/2x28 threaded barrel, pistol rail, Hahn semi permanent block that hold bolt open on last round with 5.56 bolt catch installed (semi permanent means must remove bolt catch to install) Lula loader for colt style mags, Metalform 32rnd mag new, 9mm mag release that protrudes more than 5.56, colt style bolt. Odin Works pistol rail with hand stop. $249 Shipped Ed 912-270-5788