The One Horse OH-15 operates on a direct impingement carbine-length gas system paired with a 10.5-inch medium profile barrel and a 1:8" twist rate, delivering reliable cycling and consistent performance across a wide range of 5.56mm NATO ammunition in a compact pistol format. The 1/2"x28 threaded muzzle ships with an A2 muzzle device and is suppressor-ready for those who want to run the OH-15 in its most versatile configuration. A standard charging handle and mil-spec buffer tube provide a familiar and intuitive operating experience for any shooter already comfortable with the AR-15 platform. Specifications and Features: Manufacturer: One Horse Model: OH-15 Caliber: 5.56mm NATO Action: Semi-Auto Type: Pistol Barrel Length: 10.5" Barrel Profile: Medium Twist Rate: 1:8" Gas System: Carbine Muzzle Device: A2 Muzzle Thread: 1/2"x28 Handguard Length: 9.25" Handguard Type: M-LOK Charging Handle: Standard Buffer Tube: Mil-Spec Grip: A2 Brace: KAK Pistol Brace Finish: Black Weight: 7.14 lbs. Included Magazines: 1x 30 Round