The Glock Factory Gen 4 Magazine for Glock 31 in .357 Sig is the genuine article—a 15-round polymer magazine built to Glock's own specs and backed by decades of proven reliability in the field. If you're running a G31 and need dependable spare mags that feed every round without fuss, factory Glock magazines are the no-compromise choice. This isn't some aftermarket knockoff; it's the same magazine that ships with the pistol, engineered to handle the rigors of duty carry, competitive shooting, or range work.

Glock magazines are engineered around a simple principle: durability and function over flash. The 15-round capacity gives you serious firepower for a .357 Sig platform, and the polymer construction paired with a hardened steel insert means the mag can take a drop, get jammed in a range bag, or survive years of heavy use without losing shape or reliability. The integrated viewing windows let you count your rounds at a glance, and the polymer base plate is both lightweight and tough.

Whether you're building a backup magazine stash, replacing a worn mag, or just making sure you're never caught short on ammo, a factory Glock magazine is the smart, proven buy. It's the same feed reliability and construction that has made Glock pistols trusted by shooters worldwide.

Key Features

• 15-round capacity in .357 Sig
• Hardened steel insert encased in high-tech polymer for impact and deformation resistance
• Viewing windows for quick round-count verification
• Polymer base plate for durability and lightweight design
• Factory Glock construction ensures reliable feeding
• Compatible with Glock 31 pistols

Specifications

Frequently Asked Questions

Will this Gen 4 magazine work with my Glock 31?

Yes. This magazine is factory-engineered for the Glock 31 and is the exact magazine shipped with the pistol. It is fully compatible with all Glock 31 models.

What's the difference between this factory Glock magazine and third-party options?

This is a genuine Glock factory magazine built to Glock's specifications. The hardened steel insert combined with polymer construction is Glock's proven design. We can only speak to what we know; we recommend factory mags for maximum reliability, especially for carry or duty use.

What's included in this product?

You receive one 15-round Glock factory magazine for the .357 Sig Glock 31. The magazine ships complete and ready to use.

Can I see how many rounds are loaded in the magazine?

Yes. The magazine features integrated viewing windows that allow you to quickly verify your round count without unloading.