Glock 31 Gen4 .357 SIG
Model: PG3150203
Glock 31 Gen4 .357 SIG
Model: PG3150203
Full Specifications
About This Firearm
The Glock 31 Gen4 is a polymer-framed striker-fired .357 SIG built for duty use. Glock has dropped it from the commercial range and the surviving listing sits under law enforcement, so a complete pistol is a used buy. Its magazine holds 15 rounds behind a 4.49-inch barrel, and three magazines came in the box.
The frame takes interchangeable backstraps, and the extended magazine catch reverses for a left hand, so the gun can be set up for either hand. The trigger breaks at 6.3 lbs. There is no optic cut in the slide and Glock never built an optic-ready version in this chambering, so a dot means milling or a replacement slide. The gun is 7.95 inches long, 5.47 inches tall and 1.26 inches wide at 26.1 oz, with a steel slide in Glock's nDLC finish over a polymer frame.
If you're cross-shopping, the Glock 32 Gen4 is the compact in the same cartridge, 13 rounds behind a 4.02-inch barrel at 24.34 oz. The Sig Sauer P320 Full-Size is heavier at 29.5 oz with a longer 4.7-inch barrel and a fire control unit that lifts out of the grip module. Neither one is easy to find as a new complete pistol in this chambering.
Best For
Strengths & Limitations
- Three magazines shipped with the pistol, so a used gun often comes with spares.
- The backstraps and the reversible magazine catch are frame hardware and not wear items, so a used gun still has them.
- The slide carries the nDLC treatment Glock uses on its current pistols, which holds up to sweat in a duty holster.
- The sights are polymer, and a white outline rear is slow to find in poor light next to a steel night sight.
- Ammunition choice in .357 SIG is narrow next to 9mm, and it costs more per round.
Category Rankings
How the Glock 31 Gen4 .357 SIG ranks among full-size .357 SIG handguns.
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See how the Glock 31 Gen4 .357 SIG stacks up against similar firearms.
Ballistics Calculator
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Alternatives to Consider
Similar full-size .357 SIG handguns ranked by similarity.
| NAME | BEST PRICE |
|---|---|
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Sig Sauer P320 Full-Size .357 SIG
Sig Sauer
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|
Sig Sauer P226 .357 SIG
Sig Sauer
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Frequently Asked Questions
What came in the box?
The pistol with one magazine, two spare magazines in the US, a magazine speed loader, a cleaning set, the manual, a case, the backstrap set and a cable lock.
What sights did it ship with?
Glock's standard polymer fixed set, a white dot front and a white outline rear.
What is the twist rate?
A 1:9.84 twist, the same rate Glock cuts across its .357 SIG pistols.
