The Springfield Armory Hellion Bullpup is a semi-automatic rifle chambered in .223 Rem/5.56 NATO, featuring a 20-inch barrel. This model includes one 30-round magazine and is designed in a black finish, measuring 33.75 inches in length. The rifle is equipped with low profile flip-up front and rear adjustable sights, and it features an ambidextrous safety lever.Key FeaturesIncluded Magazines: Ships with one 30-round magazine.Barrel Length: Fitted with a 20-inch barrel.Rate of Twist: 1-in-7 inch twist rate for improved bullet stability.Sights: Comes with adjustable low profile flip-up sights.