Due to a process called Single Point Cut Rifling, these replacement barrels have an exact twist and a more uniform bore and groove. These barrels are pre-lapped before rifling and finish-lapped after rifling. This pale brown .300 Win Mag barrel is 26" in length, has a M18x1.5, and fits Accuracy International AXMC rifles. Win Tactical Accuracy International .300 Win Mag M18x1.5 26" Pale Brown AXMC Barrel 1526041PB