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It's an Armalite. It started life as a Def-10. It now has a twenty inch barrel with A-2 handguard.
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I had the same problem with my Def10 with the PMags that came with it. Came with 3, none of them would drop free period. Loaded, unloaded, cold or hot.
I sold them, bought some newer ones from a newer batch, and they function flawlessly. When the Gen3 mags came out, there were a couple of issues that Magpul rectified after a few batches.
Try some newer ones, they should work. But i opted for the Lancer mags, and now have a 6 of those as my goto mags. Pmags for the range, lancers for when they HAVE to work. I haven't been keeping proper records after 1500rds, but ib think I'm over 2000 now and have not had a single failure yet.
I also only use domestic ammo, no surplus, nothing made outside of USA.