The Ruger Mini-14 Tactical .300 AAC Blackout is a semi-automatic rifle featuring a 16.1-inch blued barrel and a rate of twist of 1:7 inches. This model is designed with a Garand safety and includes two 20-round detachable box magazines. The rifle is equipped with a blade front sight and a ghost ring rear sight.Key FeaturesIncluded Magazines: Ships with two 20-round detachable box magazines.Thread Pattern: Features a thread pattern of 5/8"-24 tpi.