This is a factory 13-round magazine for Gen 4 Glock 21 and 21SF pistols in .45 ACP

Glock’s .45 ACP combat pistols are known for their massive capacity, easy-to-handle recoil, and ultra-reliable performance. Designed to feed consistently in even the most extreme environments, Glock factory magazines are the ONLY choice for serious shooters …

These standard capacity, full-size factory magazines give you 13 rounds of big bore .45 ACP in a crack-resistant polymer magazine with full length reinforcing steel inserts, steel spring wire internals, and numbered witness holes.

Fits Glock 21 and 21 SF pistols.

Glock magazines typically come with stiff springs from the factory, but they wear in quickly and become easier to load and unload after a few shooting sessions. Consider upgrading your magazine loader to get even more trigger time. Glock magazines come with a very strong spring rate from the factory to ensure reliability in the toughest of conditions. Sometimes, magazines are found to be a little bit difficult to load at first. However, after a few times loading and unloading, the springs break in nicely and it becomes much easier to load.

We recommend using a magazine loader to ease the loading process.

For added strength and durability factory Glock magazines are steel lined on the interior with a crack resistant polymer body. This increased durability gives officers, military members, and dedicated citizens the confidence that there will be no issues under heavy training.

Grab a few spare magazines for your Glock 21/21SF pistol today!