The lightweight, semi-automatic REC7 Gen II uses a one piece 17-4 stainless steel piston with two position gas plug. This 5.56 NATO Barrett REC7 Gen II Rifle features an 18" DMR barrel, olive drab green Magpul MOE stock, Barrett muzzle brake, keymod rail attachment, SDE trigger, flip up iron sights, and one 20 round magazine. Barrett REC7 Gen II 5.56 NATO DMR OD Green 14954