Upgrade or replace the barrel on a 1911 Full-size with this original SIG SAUER part. The threaded barrel is chambered in .45ACP and allows you to attach a suppressor or other muzzle device. A knurled thread cap protects the end when no device is attached. SIG SAUER factory replacement pistol barrels are specially heat-treated for toughness and durability. Includes link and pin. May require fitment.