Wilson Combat Match-Grade Barrels are known for their unsurpassed quality and accuracy. Wilson Combat match barrels are fully machined from aircraft grade stainless steel forgings and heat-treated to R/C 40 for maximum service life. Critical manufacturing tolerances are held to less than .0005 inches (one half thousandth of an inch.). To give you phenomenal accuracy, extreme care has been taken to assure that the chamber is glass smooth and perfectly concentric with the bore. In our barrel test fixture we routinely obtain test groups of 1/2 inches at 25 yd. 1:16 inches Twist Aircraft Grade Stainless Steel Forgings Heat-Treated to R/C 40 Glass Smooth Chamber Includes Barrel Bushing