Custom KYDEX® Holsters for the Glock 31
The Glock 31 is the .357 SIG believer’s gun — the bottleneck cartridge that state troopers swore by, still riding duty belts and coming home as some of the best trade-in values on the market. ANR Design builds custom KYDEX® Glock 31 holsters precision-formed in Manchester, NH — the G31 is explicitly covered on our Glock 17 fitment, Gen 2 through Gen 6, because the 31 and 17 share the geometry a holster indexes on. That opens the full catalog to it: IWB, Nidhogg OWB, the Daishō AIWB sidecar, and over twenty molded weapon-light fitments. Left-handed and most light-bearing builds qualify for our fastest Quick Ship tier. Configure yours below.
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Glock 31 Fitment & Compatibility
The Glock 31 shares slide and frame dimensions with the Glock 17 — the .357 SIG bottleneck lives in the chamber, not the external geometry — so the G31 runs on our G17 precision shell with full audible click retention, covered explicitly across Gen 2 through Gen 6. The same shell also serves the 17, 17M, 17 MOS, and Glock 47, so a caliber conversion or a future gun swap keeps your holster.
Every Glock 31 holster ships optics-ready for slide-mounted red dots and clears suppressor-height sights as standard.
Carry Options for the Glock 31
Inside the Waistband (IWB): Our IWB rig conceals the full-size frame with an in-house concealment claw and your choice of injection-molded clips, heat-treated DCC Monoblock steel, or the NeoMag Alias system. Left-handed and most light-bearing G31 builds qualify for our fastest Quick Ship tier, with the exact lead time shown live in the builder.
Light-Bearing: The full Glock full-size light catalog applies — over twenty molded fitments including the Streamlight TLR-1 / HL / HL-X, TLR-2, TLR-7 / 7A / 7X / HL-X, Surefire X300U-A & B, X400 Ultra, XC1, XC2, XC3, and XVL2, Modlite PL350, Inforce APL, APL 3.0, APLc & WILD 1, Olight PL-Mini, PL-Mini 2, PL-2 & PL-Pro, Sig Foxtrot1X & 2R — and the Glock GTL-10. Every shell is molded to the exact gun-and-light combination.
Nidhogg OWB: The same fitment and light catalog outside the waistband — range days, working carry, or duty-style configurations.
Daishō AIWB Sidecar: The Daishō’s 17/22/31 shell (Gen 3–6) covers the G31 — holster and magazine carrier bridged by a flexible Tegris wing, with left-handed builds Quick Ship eligible. Pair it with a spare-mag carrier from our Pistol Mag builder, which covers the Glock 9/40/357 SIG magazine series.
Frequently Asked Questions
Will a Glock 17 holster fit my Glock 31?
Ours will — the G31 is explicitly covered on our Glock 17 fitment, not fitted by assumption. The .357 SIG’s bottleneck cartridge changes nothing about the external geometry a holster molds around.
I bought a police trade-in Glock 31 — will your holster fit it?
Yes — trade-in G31s are typically Gen 3 or Gen 4, both fully covered. Finish wear from a previous duty holster doesn’t affect retention; the shell indexes on frame and trigger guard geometry, which doesn’t change with use.
Can I get a light-bearing Glock 31 holster?
Yes — the G31 carries our full Glock full-size light catalog, over twenty molded fitments from the TLR-7 through the Surefire X300 and X400 series. Select your exact light in the builder.
If I convert my G31 to 9mm or .40 with a conversion barrel, does the holster still fit?
Yes — conversion barrels change nothing externally, and the shell fits identically. The same holster also covers a full slide swap to G17 or G22 configurations within the fitment’s generation range.
What warranty comes with a Glock 31 holster?
Every ANR Design holster includes a free Lifetime Warranty on the KYDEX® shell for the original purchaser — automatic on every order, no registration.