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 inch (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. Throughout the manufacturing process each barrel undergoes multiple quality-control checks, with a detailed final inspection. 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.