The One Horse OH-15 is a modern sporting rifle chambered in 5.56 NATO/.223 Remington with a 16-inch barrel and 30-round magazine capacity.One Horse OH-15 Semi-Automatic Modern Sporting Rifle5.56 NATO/.223 Remington caliber16-inch barrel length with 1:8" rate of twist30-round detachable magazine36-inch overall length 7.15 poundsBlack synthetic stock with black metal finishSemi-automatic action with swivel studsDesigned for sporting applications this rifle combines reliable semi-automatic operation with modern features and ergonomics for recreational shooting and sporting use.