ARC mags

They work great until you get them dirty. The other thing to know, they won’t work well with a stock rem 700 as they do not have a binder plate to limit rounds shifting forward and hangin up under your feed ramp. If you get your rem’s feed ramp notched, this is a non issue.
 
Don't buy them, and don't buy Alpha mags either... in my experience. AI, Accurate-Mags, have worked fine for me. The feed lips may need tweaking for best function with any of the metal ones, depending on action/bottom metal etc.
 
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ARC mags wouldn’t work with my Remington or Curtis Axiom. I would have to modify the action and wasnt willing to do it. Never fired a shot using them as they wouldn’t work in the living room.
 
I run ARC mags in my Bravo with a Nucleus action. I didn’t have any issues with mine, but a buddy of mine picked one up that would bind up with everything. After about 10 minutes with a dremel, I got it working fine. I wouldn’t recommend them though, there are much better upticks out there.
 
Also running ARC mags in a Nucleus/ KRG W3 setup. Relatively early in my experience but no issues to date after several trips to the range.