GLS (Grip Lock System) secures weapon once holstered; retention is deactivated with the middle finger upon a standard shooting grip on the weapon Designed to fit multiple weapons in one holster, adjustment available to further customize fit Body is proprietary nylon blend that is non-abrasive to a firearms finish, maintains very high heat tolerance, low cold tolerance Low-cut and compact design make concealment easy while also allowing for a quick draw The Model 578 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 175 firearms. The 578 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 includes an injection-molded paddle and an injection-molded belt loop that is adjustable for maximum comfort and allows the holster to be worn cross draw. Gun fit: FN FNS 9 FN FNS 40 H&K USP 9 H&K USP 40 H&K USP 9C H&K USP 40C H&K VP9 H&K HK45C Ruger Security 9 Smith & Wesson 5906TSW Smith & Wesson SW99 Walther P99 FN 509 Walther P99 DAO Walther P99 QA Walther PPQ Walther PPQ M2 Walther PPS Glock 19 Glock 23 Glock 19X Glock 45 Glock 38 Glock 39 H&K P30