M1 Garand Tanker Barrel 18" Criterion .308 / 7.62 NATOThese shorter .308 / 7.62 NATO "Tanker" Barrels are direct replacement barrels for the M1 Garand rifle and manufactured to mil-spec. Original G.I. contours and parkerized like original finish. Barrels are made from 4140 chrome moly steel, button rifled, contoured, and finish lapped after contouring. Chambered for .308 /7.62 NATO, 18.25" in Length and 1-10" four groove rifling. **Barrels are chambered .010 away (short) from finish size to be fitted and head spaced when assembled to fit your receiver and bolt dimensions. *** ASSEMBLY AND HEAD SPACING BY A QUALIFIED GUNSMITH IS REQUIRED!