STI barrels are made from 416 rifle grade stainless steel. The bore is gun drilled, button rifled and air gauged to the most exacting size and most consistent 1 in 16" twist available. Barrels are short chambered to allow gunsmiths to fit the chamber for each particular caliber. Requires installation and fitting by qualified gunsmith.
Made of 416 Rifle grade stainless steel billet forgings
Gun drilled, button rifled and air guaged
Vacuum heat treated and vacuum tempered to 40Rc hardness
Chambers are short cut to allow for gunsmith finishing