Why the DURAMAG 15-Round Stainless Steel Mag is Our Top Pick for ARC Cartridges

At Ally Munitions, we don’t just sell products—we put them through real-world testing before they ever make it to our website. When it comes to 6mm ARC, 6.5 Grendel, and .22 ARC, magazine performance can be inconsistentdepending on the rifle setup. That’s why we’ve spent extensive time testing multiple magazines to find the best-performing option for the ARC family of cartridges.

After running numerous sample sets, I can confidently say that the DURAMAG 15-Round Stainless Steel Mag has performed the best across various rifle setups. While we haven’t started testing on .338 ARC, this magazine has set the standard for ARC reliability in everything else we’ve put it through.

Our Findings from Testing

One thing I’ve learned through all this testing is that magazine reliability isn’t just about the magazine—your lower receiver, bolt catch, and BCG all play a role in how well a mag will function. Because of these factors, we can’t guarantee that this mag will run flawlessly in every build. However, after thorough testing, we can say this is our most recommended magazine for 6 ARC and its related cartridges.

We also strongly recommend running mags slightly under capacity when using ARC cartridges. This reduces pressure on the rounds and helps ensure smoother, more reliable feeding. It’s a trick we’ve used in testing, and it makes a noticeable difference.

Why DURAMAG?

This 15-round stainless steel magazine stood out for a few key reasons:
✔ Solid stainless steel construction for durability
✔ Diamond-coated finish for corrosion resistance and smooth function
✔ EverFlex anti-fatigue spring for consistent feeding
✔ Anti-tilt follower to prevent jams

Throughout testing, it outperformed most other mags, and only one other option—the Geissele magazine—came close. For now, we’re offering DURAMAG because we trust it, and we know many of you are looking for a reliable ARC magazine.

Final Thoughts

We’ll continue testing new options as they come out, but for now, this is our go-to recommendation. If you’re running an ARC-based rifle, you’ll want to try one of these in your setup.

As always, your specific rifle will determine how any mag performs, so be sure to test it in your own configuration. We’re just here to share what’s worked best for us after putting thousands of rounds through these mags.

? Check out the DURAMAG 15-Round Stainless Steel Mag now, available at Ally Munitions!