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 .260 Rem barrel is 26" long, has a 5/8x24 thread, and fits Accuracy International AT/AX short action rifles. Accuracy International ATAX .260 5/8"-24 26" Pale Brown Barrel 1226062PB