The Wilson Combat 33D features match grade barrels meticulously crafted by Wilson Combat. These barrels are entirely machined from stainless steel forgings that boasts aircraft-grade quality for unparalleled strength and durability. Furthermore, these barrels undergo heat treatment to R/C 40 to ensure they offer the maximum service life imaginable.At Wilson Combat, we pay extreme attention to detail during manufacturing. We monitor tolerances and ensure they are kept to less than .0005\" (one half thousandth of an inch) to guarantee precision. Please note that all our barrels are slightly oversized in the lock-up areas and will require pistolsmith fitting to ensure optimal performance and fit.We highly recommend our ramped barrels for alloy frame pistols. They have been designed to provide maximum reliability. Unless otherwise specified, all ramped barrels are cut to Wilson\'s proprietary specifications.