Glock G31 Gen4 .357 SIG Full-Size with TruGlo Tritium Sights and Pyramid Flat-Faced Trigger, 3x 15-Round Mags, 4.49 in Barrel
This Austrian-made Glock G31 Gen4 stands out as a full-size .357 SIG with thoughtful upgrades and documented history. It features factory-marked TruGlo TG-H3 tritium 3-dot sights and an aftermarket Pyramid flat-faced trigger with a red safety blade. The package includes three 15-round factory magazines and the original Glock case, backstraps, tools, and paperwork, including the factory test/inspection card dated 02/07/2014.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Distinct polygonal rifling with strong definition.
Specific Condition Details: Minimal evidence of prior use is present. The bore is bright with a mirror-like finish.
What’s Included
- Glock factory hard case
- Manual
- Three 15-round .357 SIG Glock factory magazines (body code 4363-03; witness holes to 15)
- Glock Gen4 interchangeable backstraps (two inserts, includes beavertail)
- Glock cleaning rod and bore brush
- TruGlo TG-H3 tritium 3-dot sights (installed)
- Aftermarket Pyramid flat-faced trigger with red safety blade (installed)
- Factory test/inspection card dated 02/07/2014
The G31 Gen4 is a full-size .357 SIG built on Glock’s polymer frame with the Gen4 Rough Textured Frame, finger grooves, and modular backstraps for a tailored grip. It uses the Safe Action system with a striker-fired, short-recoil, locked-breech design, and includes an enlarged, reversible magazine release for user-configurable control. A Glock accessory rail is molded into the dust cover for compatible attachments.
This pistol is upgraded with TruGlo TG-H3 tritium 3-dot sights. The front sight base carries the TG-H3 marking, and the tritium lamps provide a consistent, low-light aiming reference. The aftermarket Pyramid flat-faced trigger with a red safety blade is installed, giving the pistol a flat trigger profile that many shooters prefer for its consistent finger placement.
The 4.49 in steel barrel uses polygonal rifling with a right-hand twist, and the .357 SIG chambering is clearly stamped “357” on the slide and magazines. Standard capacity is 15+1, and this example includes three factory 15-round magazines with body code 4363-03 and numbered witness holes to 15.
Origin details are clear with the slide marked “31 Gen4 AUSTRIA 357,” and the importer/origin legend “MADE IN AUSTRIA GLOCK, INC., SMYRNA, GA.” molded into the right side of the polymer frame; the included factory test/inspection card is dated 02/07/2014. Overall execution, documentation, and the installed upgrades make this a strong, turnkey Gen4 package in a desirable .357 SIG configuration.