GLOCK 31 Gen 4 Standard | .357 Details

The GLOCK 31 Gen 4, in 357 SIG, is the optimal solution for those seeking high muzzle velocity and superior precision in a reliable, yet lightweight, pistol with large magazine capacity. The Modular back strap system makes it possible to instantly customize its grip to accommodate any hand size. The reversible magazine catch makes it ideal for left and right-handed shooters.

Glock 31 Specs

Caliber / System

  • .357 / Safe Action


  • Length: 204 mm / 8.03 in.
  • Height: 138 mm / 5.43 in.
  • Width: 30.00 mm / 1.19 in.
  • Barrel Height: 32 mm / 1.26 in.
  • Length Between Sights: 165 mm / 6.49 in.
  • Barrel Length: 114 mm / 4.48 in.


  • Unloaded: 740 g / 16.12 oz.
  • Loaded: 940 g / 33.18 oz.
  • Trigger Pull / Travel –
  • Trigger Pull: ~2.5 kg / ~5.5 lbs.
  • Trigger Travel: ~12.5 mm/ ~0.49

Barrel Rifling / Length of Twist

  • Barrel Rifling: right hand, hexagonal
  • Length of Twist: 250 mm / 9.84 in.
  • Magazine Capacity –
  • Standard: 15
  • Optional: 10


Glock 31 Build

For the record, it should be noted that this review is dealing with the Glock 31 Generation 4 – the latest iteration in the G31’s lifespan, and the most updated of the line. Part of the benefit to owning a Gen 4 Glock gun is in the interchangeable back straps provided by Glock – a feature that makes for a more broadly appealing, accessible gun as far as build and handle.

The factory grip of the G31 is a bit on the compact size as compared to prior Glock models, but whether or not this is optimal would depend on the hand size and preferences of the individual handling the gun.

Overall, the build of the Glock 31 follows the same general template established by the other members of the Glock family – a polymer and metallic blend in the body, a large slide with handy ribbing at the end for improved grip, ergonomic finger grooves for the grip, and handy and easily accessible controls, especially in the Gen 4 model which utilized a larger magazine release button.



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