Glock G21 .45 ACP Magazine 10-Round Factory

Glock Factory Magazine for G21 .45 ACP

These are genuine Glock factory magazines engineered for the G21 .45 ACP pistol. They represent the standard against which all other magazines are measured.

Construction and Durability

Glock magazines feature a proven design combining high-tech polymer with a hardened steel insert. This hybrid construction provides:

• Lightweight durability — The polymer body resists deformation and damage
• Drop-free reliability — Magazines release cleanly from the pistol
• Impact resistance — The protective polymer coating withstands drops from significant heights without permanent damage

Break-In Period

New Glock magazines may feel stiff when loading. This is normal and expected. The magazine springs require a brief break-in period:

• Load the magazine with nine rounds and leave it loaded for several days to allow the spring to compress naturally
• Cycle the magazine from full to empty multiple times to accelerate the break-in process
• After this period, loading becomes noticeably easier

This break-in is a one-time occurrence and reflects the quality of the spring — it's engineered to maintain tension over thousands of cycles.

Capacity

10-round capacity per magazine.