The Model 577 GLS Pro-Fit brings the unique GLS (Grip Lock System) and SafariSeven together in a holster designed to fit a wide variety of guns. The Pro-Fit is customizable and adjusts to securely fit over 100 firearms. The 577 also features the GLS, an innovative technology that automatically secures the weapon when holstered and releases it upon application of the middle finger with a standard shooting grip for a more intuitive and safer release. The holster body is constructed with SafariSeven, a lightweight, state-of-the-art nylon blend is completely non-abrasive to a guns finish, tolerant of extreme high and low temperatures, and easy to maintain. This holster features an injection-molded belt loop that fits 1.5 (38mm) and 1.75 (45mm) belt widths. Gun fit: Colt 1911 CZ 75 Ruger American 45 Sig Sauer 1911 Smith & Wesson M&P 9L Smith & Wesson M&P 40L Smith & Wesson M&P 2.0 9L Smith & Wesson M&P 2.0 40L Smith & Wesson M&P 9L CORE Smith & Wesson M&P 40L CORE Smith & Wesson M&P 2.0 9L C.O.R.E. Smith & Wesson M&P 2.0 40L C.O.R.E. FN FNS 9 Springfield 1911-A1 Taurus 1911 Walther PPQ Walther PPQ M2 FN FNS 40 FN Five-Seven Glock 17L Glock 34 Glock 35 Glock 41 Kimber 1911