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The .400 Legend's straight-wall case design requires magazine geometry that standard .223 or 5.56 magazines simply can't provide. Trying to feed .400 Legend rounds from a conventional AR magazine creates binding, misalignment, and feeding failures. That's why DURAMAG engineered this 10-round magazine from the ground up specifically for this cartridge.
Constructed from premium 410 stainless steel, this magazine won't flex, swell, or develop feed lip failures like polymer alternatives, even during extended storage while loaded. The T-360 coating covers the entire magazine inside and out, resisting corrosion and creating a smooth, low-friction loading experience. You get a magazine that handles harsh field conditions without degradation.
This mag features caliber-specific rib geometry that's critical for proper cartridge stacking and feeding performance. The Advanced Geometry Follower keeps each round level and consistently presented to the feed path. Combined with DURAMAG's EverFlex anti-fatigue spring technology, the magazine cycles smoothly through every shot. LipLock technology maintains secure round alignment, preventing the kind of tipping and binding that plagues generic magazines.
While designed for .400 Legend, users report these magazines also function well in .338 ARC rifles, making them a versatile choice if you're building in either caliber. The magazine body is clearly marked with .400 Legend identification, so there's no confusion in the field. The 10-round capacity works for range days, hunting applications, and states with specific magazine restrictions.
No. The .400 Legend's larger diameter and straight-wall case require specialized magazine geometry that standard AR magazines don't have. Attempting to use conventional magazines will result in feeding failures, binding, and reliability issues. You need a purpose-built .400 Legend magazine like this DURAMAG to feed reliably.
This magazine is designed from the ground up with .400 Legend-specific rib geometry, proper cartridge stacking dimensions, and an Advanced Geometry Follower tuned for this cartridge. It avoids the feeding problems and magazine deformation that comes from trying to modify standard magazines or use makeshift solutions. The stainless steel construction also holds its geometry indefinitely, even while loaded.
Yes. Unlike polymer magazines that can develop swell and feed lip failures over time when stored loaded, the 410 stainless steel construction won't flex or degrade. DURAMAG specifically designs these for safe extended storage while loaded, making them ideal for keeping ready for hunting season or emergency use.
While designed for .400 Legend, users have reported reliable function in .338 ARC rifles as well. If you're planning to use it in a different caliber, it's worth testing before relying on it, since feeding can be caliber-specific. The magazine body is marked .400 Legend to indicate its primary design purpose.
| UPC | 766897411489 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 1040041172CPD |
| Caliber/Gauge | .400 Legend |
| Capacity | 10 |
| Color | Black |
| Length | 4.5500 |
| Model | |
| Product Type | Magazine |
| Quantity | 1 |
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