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Glock 45 ACP 13 Round G21 Gen 4 Magazine




his is a factory 13-round magazine for Gen 4 Glock 45 ACP 13 Round G21 Gen 4 Magazine 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/accessories are the ONLY choices for serious shooters …

These standard capacities, 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.

This is a factory original, drop-free magazine for your Glock. Glock 45 ACP 13 Round G21 Gen 4 Magazine has a hardened steel insert encased in the high-tech polymer. This polymer coating protects the magazine and prevents deformation, even when dropped from a great height.

Technical Information:

  • Glock magazines have very stiff springs when new and may be extremely difficult to load to full capacity. It may be necessary to use a Glock magazine loader (generally included in the Glock case with the handgun) to load the magazine to capacity or near capacity.
  • If the last round appears impossible to load, for example, if the magazine should hold 15 rounds and it will only accept 14, leave it loaded with 14 rounds for several days to allow the spring’s tension to decrease. After a short time, the magazine should then accept its full capacity, but it may still be necessary to use the magazine loader. After several cycles of full capacity through empty, the magazine will be easier to load.


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