Bushmaster ACR (Advanced Combat Rifle) which is very similar to the FN-SCAR. Short 16 1/2 inch barrel with a piston driven gas system. One piece (monolithic block type) anodized aluminum upper receiver with a Mil-Std 1913 Picatinny rail on top with a multi-lug, round rotating bolt similar to the AR15 rifle. Standard markings. It has a one-piece, lower trigger guard/pistol grip assembly with a complete separate compartmentalized trigger group. Free floating barrel with an adjustable/removable gas plug similar to the FN-FAL with a one-piece plastic hand guard. Fitted with a plastic buttstock with an adjustable cheekpiece. It comes with one 30 round Brownells, AR15 type magazine.