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Gunsmithing ARC Magazine

I don’t run ARC mags. Ai, magpul, alpha, and accurate for me.

I run some of the tbm and love them! The mags are decent but when I went to 260ai the shoulders were too wide for them so I switched the one gun to ai style mags
 
ARC mags will work and work well. The follower has been an issue at times. ARC is aware of this and itll be corrected this year.

As an interim solution I began making billet aluminum followers that address the issue. A little more money, but they solve the problem.

Happy to help.
You’ve made ARC mags work in a FN Tbm already??