The Safariland 537 GLS Open Top Belt Slide Holster (Safariland part no. 537-450-61) is built for the Sig Sauer P320 in 9mm and .40 caliber, right-hand carry, using Safariland’s Grip Lock System (GLS) for retention instead of a strap or hood. GLS automatically secures the pistol the moment it is holstered and releases only when the middle finger presses the release during a standard shooting grip, keeping the draw fast and intuitive without extra motions. The soft, flexible holster body is designed to mold itself around the wearer over time for an increasingly comfortable, close carry. Tension adjustment lets the fit be tailored to the individual pistol, and the open-top belt slide design keeps the whole package slim for concealed or duty carry.

Key Specifications

• Uses Safariland’s Grip Lock System (GLS), which secures the pistol automatically once holstered.
• Retention releases via the middle finger during a standard shooting grip, so no separate thumb break is needed.
• The soft, flexible holster body molds to the wearer over time for a more comfortable, close carry.
• Tension adjustment lets the wearer customize how firmly the pistol sits in the shell.
• Sized to fit 1.5-inch (38mm) belt widths.
• Configured for right-hand carry.

Frequently Asked Questions

How does GLS retention release the pistol? The middle finger presses the GLS release as part of a standard shooting grip, so the draw motion doubles as the release.

What belt width does this holster fit? It is sized for 1.5-inch (38mm) belt widths.

Is this the right-hand or left-hand version? This listing is the right-hand configuration.

Buy the Safariland 537 GLS Open Top Belt Slide Holster

A retention system that releases as part of your natural grip means one less step between you and the target. This Safariland 537 GLS holster gives Sig P320 9/40 owners that speed in a slim, open-top belt slide design. Shop our holsters and gun leather selection from Safariland, and our Lubbock, Texas team can help confirm fit and tension setup.