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There used to be an outfit called "CNC Gunsmithing" that made an 80% billet lower that they called the AR-45. It used M3 grease gun mags and works well. The same mags will work with the 10mm as it's only .030" longer if you modify the feedlips slightly to insure that the round will stay in place. I did have to sort through the mags that I had just to make sure that that extra .030" didn't bind partway down.
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