Glock G31
Glock Ges.m.b.H. · Pistol · Discontinued · 1997
Also known as: G31, Glock 31
Overview
The Glock G31 is a semi-automatic pistol chambered in .357 SIG, produced by Glock Ges.m.b.H.
Specifications
| Weight (empty) | 660 g (23.3 oz) |
| Weight (loaded) | 940 g (33.2 oz) |
| Overall Length | 204 mm (8.03") |
| Barrel Length | 114 mm (4.49") |
| Height | 139 mm (5.47") |
| Width | 32 mm (1.26") |
| Sight Radius | 165 mm (6.50") |
| Action Type | Short Recoil |
| Firing Mechanism | Striker Fired |
| Trigger Type | Safe Action |
| Trigger Pull | 28 N (6.3 lbf) |
| Magazine Capacity | 15 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 430 m/s (1411 fps) |
| Muzzle Energy | 748 J (552 ft·lbf) |
| Effective Range | 50 m (55 yd) |
| Maximum Range | 1800 m (1968 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 400 mm (15.75") |
| Number of Grooves | 6 |
| Frame Material | Polymer |
| Slide Material | Steel |
| Barrel Material | Steel |
| Finish | Tenifer |
Calibers
- .357 SIG · primary — also known as 357 SIG, 9x22mm
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Trigger Safety, Firing Pin Safety, Drop Safety
- Features: Polymer Frame, Safe Action Trigger, Hexagonal Rifling, Accessory Rail, Ambidextrous Slide Stop, Textured Grip, Reversible Magazine Release, Striker Fired
Variants
- Glock G31C — Compensated
- Glock G31 Gen4 — Generation
Service history
Operators
- Virginia State Police
- Delaware State Police
- Federal Air Marshal Service
- Texas Department of Public Safety
- North Carolina State Highway Patrol
Production
Production years: 1997-present
Exact production numbers not publicly disclosed. The G31 saw significant law enforcement adoption, particularly among state police agencies in the late 1990s and 2000s.
Origin
Country of origin: Austria
Designer: Gaston Glock
Notes
The G31 is dimensionally identical to the Glock 22 (.40 S&W) and can be converted between .357 SIG and .40 S&W with a simple barrel swap, as the .357 SIG is a necked-down .40 S&W case. This interchangeability made the .357 SIG Glocks attractive to agencies that could stock both calibers. The .357 SIG's bottleneck design provides extremely reliable feeding. Despite excellent ballistic performance, the .357 SIG has declined in popularity as many agencies transitioned back to 9mm following the FBI's 2014 ammunition study. The G31 has been discontinued by Glock.
Background
The .357 SIG cartridge and the Glock 31 were born from a specific law enforcement need: replicating the legendary stopping power of the .357 Magnum revolver in a modern semi-automatic with high capacity. The Federal Air Marshal Service notably adopted .357 SIG Glocks, valuing the round's ability to incapacitate threats through aircraft seat material while minimizing over-penetration risk. At its peak, an estimated 20% of U.S. law enforcement agencies used .357 SIG, with many selecting the G31 as their duty weapon.