The lightweight, semi-automatic REC7 Gen II uses a one-piece 17-4 stainless steel piston with two position gas plug. This Barrett REC7 Gen II 5.56 NATO Rifle features a 16" flyweight barrel, multi role brown receiver, Magpul MOE stock, thread protector, ALG Defense trigger, Barrett handguard KeyMod rail attachment, and one 20 round magazine.