First, the X-Bolt Mountain Pro features a true carbon fiber stock filled with a noise-dampening foam. Additionally, the Cerakote finish on the stainless steel action and barrel is also on the exterior of the stock for added protection. This special SPR version features a slightly belled muzzle that is threaded 5/8″-24 and is 4″ shorter than our standard X-Bolt Mountain Pro. A proprietary barrel lapping process enhances the bore finish. Other features include a spiral fluted bolt and bolt knob, threaded muzzle with our new Recoil Hawg muzzle brake.