MAG CMMG AR15 338ARC 10RD BLK

Description

The .338 ARC was developed to push meaningful ballistic performance out of the AR-15 platform — delivering heavier, higher-BC projectiles at extended range without requiring a larger receiver. This CMMG magazine is the factory feeding solution for rifles built around that cartridge, holding 10 rounds and manufactured in the USA to CMMG’s own specifications for their AR-15-pattern .338 ARC builds.

The high-visibility yellow anti-tilt follower does real work here. Anti-tilt geometry keeps the cartridge column aligned squarely with the feed lips through the full range of the spring’s travel, which matters more with a rebated or non-standard case head than with a conventional 5.56 round. The yellow color makes it easy to confirm the magazine is empty at a glance without counting rounds or inverting the mag — useful at the range or during a press check situation.

Construction is described by CMMG as durable, and the magazine carries the manufacturer’s warranty. Because this is a factory CMMG product built specifically for the .338 ARC cartridge rather than an adapter or modified standard magazine, feed geometry is matched to the round from the ground up. That alignment between magazine design and cartridge spec reduces the risk of feeding issues that can occur when a cartridge is forced through a magazine designed around a different case profile.

The 10-round capacity suits shooters running .338 ARC for precision work at distance, where round count matters less than consistent, reliable feeding of each cartridge. It also fits within the constraints of certain ranges and hunting applications where higher-capacity magazines are impractical or unwelcome.