The Barrett model REC7 GEN II Carbine piston operated system is a .223 Rem/5.56 NATO or 6.8 SPC semi-auto rifle with a 16″ Cold hammer-forged, chrome-lined barrel, Barrett Muzzle Brake and a Geissele SSA Trigger.. Included is one 30-round magazines, Barrett logo soft case, one accessory rail and flip-up iron sights.