The Daniel Defense DDM4 MK12 is a semi-automatic AR rifle chambered in .223 Rem/5.56 NATO, featuring an 18-inch barrel with a black phosphate finish. This model includes one 32-round magazine and has an overall length of 34.75 inches.Key FeaturesIncluded Magazine: Ships with one 32-round magazine.Barrel Length: Fitted with an 18-inch barrel for optimized performance.Rate of Twist: Features a 1:7 inch twist rate.Ambidextrous Safety: Equipped with an ambidextrous safety for versatile handling.Thread Pattern: Comes with a 1/2"x28 thread pattern.