The SIGM400 series rifle is designed for use in law enforcement, military operations, the sporting field, and competitive shooting, a true AR platform tactical rifle with unparalleled accuracy. A 16" Nitride-treated barrel provides superior corrosion resistance and a 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability that users come to expect from Sig Sauer. The reliable direct impingement gas operating system uses a rotating locking bolt. The SWAT model has a two-piece aluminum quad rail. This semi-automatic rifle features an Troy back-up sights, a collapsible stock, and a 30-round magazine. The rifle has the North Dakota State Patrol lgo on the receiver and comes with the original factory box. Its stock, metal, and bore are all in very good condition.