Glock 31 Gen 4 357 SIG 15-Round Polymer Magazine

This is a 15-round polymer magazine for the Glock 31 Gen 4 handgun, chambered in .357 SIG. It is designed to feed the pistol and fits Glock 31 Gen 3 through Gen 5 models. The magazine uses a hardened steel insert encased in polymer, which the description says helps it resist deformation when dropped.

The magazine is black with a black finish and is rated for 15 rounds. Because the springs are stiff when new, the magazine may be difficult to load to full capacity, and a Glock magazine loader may be needed. Glock states that the magazine should accept its full capacity after resting partially loaded for several days and cycling through several full loads.

• Capacity: 15 Rounds
• Caliber: .357 SIG
• Material: Polymer with hardened steel insert
• Color: Black
• Finish: Black
• Fits: Glock 31 Gen 3-5