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If you're running .338 ARC on an AR-15, you need a magazine that actually fits the cartridge properly. This CMMG magazine is built with internal geometry optimized for the .338 ARC, which is noticeably different from what you'd use for standard 5.56 rounds. While both fit the same AR-15 magazine well, the internal dimensions and follower design matter when feeding a larger bullet.
The magazine body is stainless steel with aggressive texturing that gives you a decent grip when loading. The yellow anti-tilt follower isn't just for looks. It keeps rounds properly aligned as they feed up the magazine, which is especially important with the .338 ARC's larger case and bullet diameter. The high-tensile steel spring provides consistent pressure without taking a permanent set, and the whole assembly is made in the USA.
Trying to use standard 5.56 magazines for .338 ARC tends to cause feeding issues. The CMMG magazine's precision-machined feed lips and internal angles work with the cartridge geometry instead of against it. Feed reliability has been solid in real-world testing, and the magazine handles repeated use without degradation. At 10 rounds, you get a compliant capacity that works in restricted states while still giving you enough rounds for practical shooting.
The stainless steel body resists corrosion and handles outdoor conditions. The polymer follower and spring are tough enough for range sessions and field use without being finicky about maintenance. If you bang it on a bench or drop it on concrete, it'll take the abuse. This is built to last through hundreds of reload cycles.
No. While .338 ARC shares the same bolt face as 6.5 Grendel and uses standard AR-15 magazine wells, standard 5.56 magazines have different internal geometry that causes feeding issues with the larger cartridge. The CMMG magazine is optimized specifically for the .338 ARC's dimensions and geometry.
The high-visibility yellow anti-tilt follower serves two purposes: it keeps the cartridges properly aligned as they feed up the magazine, which matters more with the larger .338 ARC round, and it lets you quickly see when the magazine is empty at a glance. The anti-tilt design prevents the follower from binding or tilting during feeding.
Yes. Testing shows this magazine generally performs well with consistent feeding across range sessions and field use. The stainless steel body resists corrosion, and the internal design handles the larger cartridge without the feeding problems you might have with adapted magazines. It'll handle hundreds of reload cycles without degradation.
Stainless steel offers better durability against dents, drops, and corrosion compared to polymer bodies. It resists spring-set loss and maintains consistent feeding pressure over time. For a magazine designed for serious use, the steel construction adds longevity without a significant weight penalty.
| UPC | 840442507497 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34AFC6B |
| Caliber/Gauge | .338 ARC |
| Capacity | 10 |
| Color | Black |
| Product Type | Magazine |
| Shipping Weight | 0.233 |
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