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" (one half thousandth of an inch). For phenomenal accuracy, the chamber is glass smooth and perfectly concentric with the bore. In Wilson's barrel test fixture, they routinely obtain test groups of 1/2" @ 25 yards. Throughout the manufacturing process each barrel undergoes multiple quality-control checks, with a detailed final inspection prior to receiving the Wilson name. You can be sure that if your barrel bears the Wilson name, it's the best there is. All barrels are slightly oversized in the lock-up areas and require pistolsmith fitting. Ramped barrels are recommended in alloy frame pistols for maximum reliability. All ramped barrels are ramped for Wilson cut unless otherwise specified.