This is a factory Glock 21 10-round magazine in .45 ACP.

Blocked at 10 rounds, this magazine is compliant with all local and State magazine capacity laws, such as California, New York, and others.

Featuring a steel-lined polymer construction, this magazine will endure and perform in the most extreme conditions. In addition, this Glock 21 10-round magazine features an anti-tilt polymer follower, precision-wound steel spring, and rear-facing witness holes. 

Some factory Glock magazine springs may be tight right out of the box. However, it helps to fully load the mag and let it sit for a few days.

Load up on extra magazines for your Glock 21 pistol today!