Precision machined from 416 stainless steel and slightly oversize in the lockup area to tighten slide-to-barrel fit. Conventional rifling gives reliable performance with both lead and jacketed bullets. Mfg: Wilson Combat SPECS: 416 Stainless steel hardened to Rc 38-40, natural finish, .40 S&W also available in black . 4-1⁄2" (11.4cm) long. May require minor fitting.