This Shaw Barrels Savage Barrel Kit includes a finished drop-in barrel, barrel nut wrench, "Go" and "No-Go" headspace gauge, and detailed instructions. This barrel is precision reamed and button rifled. Length and bore diameter are held to match quality tolerances of .0003". While not a switch barrel, this kit is an inexpensive means of unmatched versatility for a gunsmith or serious enthusiast to change the caliber, material and or contour of their Savage rifle.