Selected Handgun Detail

Manufacturer
	Glock Ges.m.b.H. More Info

About the Gun

Full-size, polymer-framed pistol chambered in .357 SIG, designed to deliver high muzzle velocity and flat trajectory in a duty-oriented package with large magazine capacity. It uses a locked-breech, short-recoil operating system with a polygonal rifled barrel and double-stack magazines holding 15 rounds standard. This is a Gen3 configuration, incorporating an accessory rail on the dust cover, finger grooves along the front strap, thumb rests on the frame sides, and the revised Gen3 grip texture pattern.

Production

Production began in 1998 and continued through the early 2010s.

Market value

MSRP at production was around $540. Used market value is around $550–$570 for good to excellent condition examples.

Cartridge Specifications
Cartridge:	357 SIG
Alias:	N/A
More Info

Analysis

Glock 31 examples share the same core mechanics optimized for the .357 SIG cartridge, demonstrating reliable durability in law enforcement duty roles and civilian applications where high-velocity performance is prioritized. Major components maintain broad compatibility with Gen3 Glock 17 parts in many areas (such as frame architecture, slides, barrels, recoil springs, and most internals), enabling extensive interchangeability and aftermarket support with only minor differences in grip feel. The polygonal rifling supports reliable function across a range of .357 SIG ammunition types—from standard-pressure to higher-energy loads—and contributes to consistent practical accuracy at extended defensive and range distances. The platform's full-size dimensions and 15-round standard capacity provide substantial firepower. Gen2 models feature checkered front and back straps on the grip with pebble-texture side panels, no accessory rail on the dust cover, and no finger grooves or thumb rests; these are scarce due to limited production (often estimated in low thousands for the initial .357 SIG run) and appeal primarily to collectors for their early transitional status, with some early slides marked ".357 SIG" instead of the later shortened ".357". Gen3 models incorporate an accessory rail forward of the trigger guard, finger grooves along the front strap, thumb rests on the frame sides, and a revised grip texture pattern, with the finger grooves and thumb rests offering ergonomic adjustments for a range of hand sizes while the accessory rail allows for mounting lights or lasers. The .357 SIG chambering produces noticeable recoil and muzzle rise compared to lower-pressure calibers in similar frames, though the pistol's weight and balance aid control for trained users. Secondary market preferences depend primarily on condition, originality, remaining finish, and individual grip fit rather than any inherent differences in mechanical performance or durability relative to other Gen3 full-size models, though the Gen2 variant commands higher interest and pricing among collectors due to its rarity.