Caliber: .357 SIG
Standard Capacity: 15 rounds
Barrel Length: 4.49 inches (114 mm)
Overall Length: 7.95 inches (202 mm)
Weight (unloaded): 26.81 oz (760 g)
Trigger Pull: ~5.5 lbs
Action Type: Safe Action® System
Frame: Full-size polymer frame
The .357 SIG round is engineered to mimic the performance of a .357 Magnum in a semi-automatic platform. It delivers incredible velocity—often exceeding 1,350 fps—making it an excellent choice for law enforcement or personal defense.
Glock’s cold hammer-forged barrel and polygonal rifling ensure tight groupings and long-term durability. The Glock 31 delivers exceptional accuracy, especially when paired with high-grain duty ammo.
As a full-sized duty weapon, the Glock 31 provides greater recoil control, enhanced sight radius, and magazine capacity over compact or subcompact models.
Many U.S. law enforcement agencies have adopted the Glock 31 due to its ballistic advantages and reliable design under high-stress conditions.
| Feature | Glock 31 (.357 SIG) | Glock 22 (.40 S&W) |
|---|---|---|
| Muzzle Velocity | Higher (1,350+ fps) | Lower (~1,150 fps) |
| Recoil | Snappier | More controlled |
| Accuracy | Slightly higher | Solid |
| Magazine Compatibility | Interchangeable (with barrel change) | Interchangeable (with barrel change) |
If you already own a Glock 22, you can convert it to shoot .357 SIG with just a barrel swap—another testament to Glock’s modularity.
Duty Carry: Trusted by law enforcement for its precision and stopping power.
Home Defense: Fast muzzle velocity and high-capacity magazines offer reliable protection.
Range Shooting: Accuracy and control make it enjoyable for serious shooters.
The Glock 31 accepts most Glock 17/22-compatible accessories:
Optics-ready slide kits
Tritium or fiber-optic night sights
Custom barrels for conversion
Extended magazines
Weapon-mounted lights
High-velocity .357 SIG performance
Excellent accuracy
Reliable under extreme conditions
Glock-compatible parts ecosystem
Ammunition is pricier and less available
Recoil is sharper than 9mm
Not as common in civilian circles as other Glock models
The Glock 31 is a high-performance, full-sized handgun that brings the ballistic advantages of the .357 SIG into the modern era. Its reliability, accuracy, and raw velocity make it an excellent choice for those who demand power and precision. If you’re considering stepping up your caliber or need a sidearm with serious kinetic energy, the Glock 31 deserves a serious look.
