Glock G31 Gen3 .357 SIG Full-Size Pistol - 4.49 in Barrel, Tenifer, 2x 10-Round Mags, Installed Extended Slide Stop & Overgrip
This Austrian-made Glock G31 Gen3 stands out as a full-size .357 SIG with the classic Gen3 frame, matching serial numbers on the frame and barrel, and user-focused upgrades installed. It features a 4.49-inch steel barrel with hexagonal rifling, a Tenifer-treated slide and barrel, and is configured for 10-round magazines with two factory magazines included.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Distinct polygonal (hexagonal) rifling.
Specific Condition Notes: Minor superficial scratches and small blemishes are present on the exterior surfaces. The bore is bright and reflective.
What’s Included
- 2x 10-round .357 SIG Glock factory magazines (polymer bodies with Glock logo/357 caliber marking)
- Extended slide stop lever (installed)
- Slip-on rubber overgrip (installed)
The G31 is a purpose-built .357 SIG platform in a full-size Gen3 frame, offering a 10+1 capacity and coming with two factory 10-round magazines. It is configured for 10-round magazines and includes matching serial numbers on the frame and barrel.
The Gen3 polymer frame adds finger grooves and an integral accessory rail, giving practical control and attachment capability. This example is customized with an extended slide stop lever for easier manipulation and a slip-on rubber overgrip for added traction.
Its 4.49-inch steel barrel uses Glock’s hexagonal rifling with a 1:9.84 in right-hand twist. The slide and barrel receive a ferritic nitrocarburized (Tenifer) treatment, and the slide features rear serrations and an external extractor.
Sights are fixed and easy to acquire, with a white-contrast front blade and matching square-notch rear. The striker-fired system is paired with Glock’s Safe Action mechanism with three passive safeties, and the magazine release is single-sided.
Origin and markings include “MADE IN AUSTRIA – GLOCK, INC., SMYRNA, GA.” Its full-size configuration, proven Gen3 features, and installed enhancements make this G31 a strong .357 SIG option.