The SB-X barrel provides the versatility of a short barreled rifle (SBR) without the burden of red tape paperwork. The SB-X barrel allows the addition of a suppressor without drastically increasing the overall length of your firearm. – The barrel length of 12.375” would be considered an SBR if not for the shroud which brings the overall length to 16.625”. This barrel avoids cumbersome paperwork and provides a shorter light-weight solution for those who love shooting suppressed. – Specs: – Weight: 13.5oz – 0.920 Barrel Diameter – Inside Diameter: 1.1 – Twist: 1-16 – Threading: 1/2×28 – Color: Matte Black – Inert/Display Suppressor NOW included!