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If you're running a Ruger AR-556 in .450 Bushmaster, this factory magazine is specifically engineered to handle what that cartridge demands. Standard AR magazines just aren't cut out for the challenge of feeding large, straight-walled rounds like the .450, and improvising will lead to feed issues or premature wear. This is a complete solution designed from the ground up.
The big difference between this magazine and generic AR-15 magazines comes down to geometry. The .450 Bushmaster is a big-bore cartridge that requires different stacking and alignment than standard 5.56 rounds. This Ruger factory magazine accounts for that with laser-welded construction and proprietary internal bracing. The anti-tilt polymer follower keeps rounds in proper position throughout the firing sequence, and the chrome silicon spring is engineered specifically for the load that .450 Bushmaster ammunition creates.
Manufactured by DURAMAG in the USA, this magazine is built from .020 gauge 410 stainless steel alloy that's heat-treated for strength and durability. The entire surface receives a proprietary Marlube finish that doesn't wear off over time—it actually burnishes into the steel, providing self-lubricating properties that protect the magazine through hundreds of cycles. You're looking at a magazine built to cycle smoothly on the thousandth round just as well as it does on the first.
The 5-round capacity keeps the magazine profile compact, making it ideal for hunters who want a streamlined package without sacrificing reliability. It maintains the same general footprint as a 20-round AR magazine, so it fits your AR-556 magazine well without issue. This capacity is also compliant in a wide range of jurisdictions where hunters use the .450 for whitetail and larger game. Whether you're at the range working on accuracy or in the field during hunting season, this magazine delivers the feeding reliability you expect from factory Ruger components.
This magazine is specifically designed for the Ruger AR-556 platform. While other AR rifles chambered in .450 Bushmaster may sometimes accept it, feed reliability depends on the rifle's geometry and feed system. Always verify compatibility with your rifle before relying on it in the field or for defensive use. The magazine well and feed lips of other manufacturers' rifles can differ significantly.
Standard AR-15 magazines were designed for smaller, tapered 5.56 rounds and have geometry that doesn't properly support the large, straight-walled .450 Bushmaster cartridge. Without proper support, rounds can tilt, double-stack, or fail to feed reliably. This factory magazine uses proprietary internal bracing and an anti-tilt follower specifically engineered for the .450, eliminating those problems entirely.
Yes. The magazine is designed to handle the mechanical stresses of a full 5-round load. The chrome silicon spring and stainless steel construction won't be negatively affected by prolonged loading. That said, periodically cycling mags in and out of use, especially if you're testing them in a duty rifle, is good practice to ensure function and spring tension remain consistent.
This is a factory Ruger magazine manufactured by DURAMAG in the USA. It's the OEM magazine that ships with the Ruger AR-556 MPR in .450 Bushmaster, so it's purpose-built specifically for that rifle. Ruger stands behind these magazines, and they're designed to Ruger's exacting standards for the AR-556 platform.
| UPC | 736676906796 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 90679 |
| Brand Fit | Ruger |
| Caliber/Gauge | .450 Bushmaster |
| Capacity | 5 |
| Color | Black |
| Length | 15.00 |
| Model | |
| Model Fit | AR-556 |
| Package Height | 0.9 |
| Package Width | 4.1 |
| Product Type | Detachable |
| Shipping Weight | 0.165 |
| Style | Detachable |
| Units per Box | 1 |
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