I will also put my +1 in for KA mags, however...
I had built a gun with a KA receiver, and KA metal magazines did not fit. How about them apples.
My recommendation, if you don't mind plastic mags are ARES/STAR 30 rounders. I have ran their 85r mags for the past 2 seasons and only had 1/10 die. Plus, they're stupidly cheap. A box set works out to be like 7$/mag
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I change primaries like other people change socks.
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