The One Horse OH-15 is a semi-automatic AR-platform rifle chambered in 6mm ARC featuring an 18-inch HBAR profile barrel with a 1:7" twist rate, a mid-length gas system, and a 30-round capacity. Built on a mil-spec buffer tube platform and equipped with a One Horse M4 6-position adjustable stock, A2 grip, and 15-inch handguard in black, it delivers a purpose-built and well-configured 6mm ARC rifle that is ready to run straight out of the box. The OH-15 ships with a standard charging handle, A2 muzzle device, and a 5/8"x24 threaded muzzle, making it a serious choice for precision shooters and hunters who want the ballistic advantages of 6mm ARC in a proven AR-15 platform.