CMMG Banshee 300 Mk57 5.7x28/Mk4 5.7x28 Conversion
5.7x28mm cal., radial delayed blowback, 5 in. CM barrel, thread protector, 20 shot Five-seveN mag., 5-pos. CMMG RipBrace, CMMG RML4 M-LOK free float handguard, Mk57 aluminum receivers, Cerakote finish, available as Mk4 5.7x28 Conversion mod...