Glock 31 slides — OEM replacements for the full-size .357 SIG duty pistol engineered for law enforcement barrier penetration and terminal performance. The G31 was developed for agencies that needed reliable performance through auto glass, sheet metal, and heavy clothing — the .357 SIG cartridge delivers rifle-like velocities and flat trajectory at distance. Whether you’re replacing a worn duty slide, restoring a classic G31, or building a custom .357 SIG platform, you’ll find the right slide here.

Our inventory covers the Glock 31 Gen 4 OEM slide — the fourth-generation design with the dual recoil spring assembly, improved ergonomics, and durable factory finish. This slide is machined from hardened steel and heat-treated specifically for the pressures and recoil of the .357 SIG cartridge, which operates at significantly higher pressures than 9mm or .40 S&W.

The G31 shares frame and slide dimensions with the G17 (9mm) and G22 (.40 S&W) — but each is a different caliber platform. The .357 SIG breech face, barrel, and magazines are specific to this slide. Standard 9mm slides are not compatible. The G31 accepts G31 (.357 SIG, 15-round) and G22 (.40 S&W, 15-round) magazines.

Every slide in this category is fit-tested before shipping and backed by our fitment warranty. Whether you need a stripped slide shell for a custom build or a complete assembly that’s ready to install and shoot, we’ve got you covered.

Not sure if the Glock 31 slide fits your frame? This slide is designed for Glock 31 Gen 4 frames. It is not compatible with Gen 3 or Gen 5 frames, and it is not compatible with standard 9mm Glock frames. Check the product description or contact us before ordering and we’ll confirm fitment for you.