The GLOCK 31 is a full-size duty pistol chambered in the powerful .357 SIG cartridge. Designed for law enforcement and civilian shooters who demand superior barrier penetration and flat trajectory, it delivers the proven reliability of the GLOCK platform with increased terminal performance. Since we began stocking it in summer 2025, it has consistently been one of our top-selling pistols in its category.
Key Features
- Chambered in .357 SIG for high-velocity performance and excellent barrier penetration.
- Built on the rugged Gen3 platform with the proven Safe Action system.
- Features a 4.49-inch barrel for optimal velocity and accuracy.
- Standard 15-round magazine capacity provides ample firepower.
- Our staff notes that compared to previous versions, the machining tolerances on current production models are noticeably tighter.
Specifications
| Caliber | .357 SIG |
| Barrel Length | 4.49 in |
| Overall Length | 7.95 in |
| Height | 5.43 in |
| Width | 1.18 in |
| Weight (measured) | 4.1 oz |
| Magazine Capacity | 15 Rounds |
| Frame Material | Polymer |
Frequently Asked Questions
Is the .357 SIG cartridge difficult to find?
While not as ubiquitous as 9mm, .357 SIG is a commercially available cartridge carried by most major ammunition manufacturers and retailers. It remains a popular choice for duty and defensive use.
Can I use .40 S&W magazines in the GLOCK 31?
Yes. The GLOCK 31 is designed to use standard GLOCK 22 (.40 S&W) magazines. The cartridges share the same case head diameter, allowing for reliable function with the correct ammunition.
What is the primary advantage of the .357 SIG round?
The .357 SIG is known for its high velocity and flat trajectory, offering superior performance against intermediate barriers like automotive glass compared to many other service pistol cartridges, while maintaining manageable recoil.
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