Glock 21 .45 ACP 13 Round Gen 4 Magazine


  • Factory magazine
  • Fit: Glock 21 pistols
  • Capacity: 13 rounds
  • Caliber: .45 ACP
  • Material: Steel-reinforced polymer
  • Features: Anti-tilt follower, steel wire, and witness holes

Availability: In stock


This is a factory OEM Glock 21 13 round magazine chambered in .45 ACP.

This Glock 21 magazine is the most reliable option for your G21 pistol. This Glock 21 mag will perform flawlessly even in the most extreme conditions, featuring a polymer body with full-length steel inserts. In addition, it features other signature Glock staples, such as an anti-tilt follower, steel spring wire, rear witness holes, and an impact-resistant base pad. What’s not to love? 

As with Glock factory magazines, their factory springs may be tough to load out of the box. However, loading and unloading a few times will help loosen the spring and become much more thumb-friendly. If you’re looking for even more thumb-relief, view our selection of magazine loaders. They’re convenient for lengthy range days or during the cold winter!

Please note that this Glock magazine fits other doublestack Glock pistols chambered in .45 ACP, such as the Glock 30.

Be sure to keep your Glock 21 running at peak performance with fresh mags. Pick up a few today!

Product Details

Weight 6 oz






Manufacturer Part


Customer Reviews

Based on 182 reviews
Eldred R.
Fast shipping.

Good prices and fast shipping. Bought several mags. 9mm and 45. No complaints and will buy from here again

Daniel B.

What can I say that hasn’t been said already. They’re Glock OEM mags. They worked perfectly in my Glock 41.

Steven P.
G21 mags

What can you say beyond...they work as glock mags always do. And Mag Shack always gets them here promptly as advertised.

Rex H.
More rounds downrange.

New mags work great in the Glock 30s and add more ammo to your shooting.

Jim C.
Great out of the box

I can’t give a full review because I haven’t shot the gun with the new clips but I can say the ammo loads nice and the clips fit well and eject good