Safariland 578 GLS Pro-Fit SafariSeven OWB Paddle Holster FN 503 Left Hand Black. The Pro-Fit is customizable and adjusts to securely fit over 225 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 gun's 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. Specifications for Safariland 578 GLS Pro-Fit SafariSeven FN 503 OWB Paddle Holster: Manufacturer: Safariland Color: Black Hand: Left Gun Make: FN Herstal Gun Model: FN 503 Holster Material: SafariSeven Holster Type: Paddle Holster Condition: New Package Contents: Safariland 578 GLS Pro-Fit SafariSeven FN 503 OWB Paddle Holster What firearm models does the manufacturer say Safariland 578 GLS Pro-Fit SafariSeven FN 503 OWB Paddle Holster is compatible with? The manufacturer suggests that Safariland 578 GLS Pro-Fit SafariSeven FN 503 OWB Paddle Holster is compatible with FN 503Safariland 1181363: 578 GLS Pro-Fit SafariSeven OWB Paddle Holster FN 503 Left Hand Black