Christensen Arms carbon fiber gunsmith barrel blanks are crafted using our proprietary layering system and offer superior strength and accuracy while weighing less than a steel barrel of the same contour. The Barrel lining is made from match-grade 416R stainless steel, which is measured to a tolerance of +/- .0001 and then bored, reamed, hand lapped, and button rifled. Includes threaded muzzle and thread protector. Mfg: Christensen Arms