G.I. Contour; Threaded & Short-Chambered

Standard G.I. contour barrels are machined from 4150 chrome-moly steel and fully threaded, with button-cut 4-groove rifling and a durable, Parkerized exterior finish. M1 Garand barrel has a 1-10" twist rate, and M14/M1A barrel has a National Match, 1-12" twist rate. Both come short-chambered—after installation, complete the chamber with a finish reamer until correct headspace is achieved.