My 20 round mags see way more use than my 30 round mags.
The only time I use 30 round mags is with my 5.45x39 AR. I use USGI 30 round mags with the old style black followers and download the mags to 25 rounds of 5.45 ammo and they run flawlessly. My straight 20 round mags will not run reliably with even 10 rounds of 5.45 ammo loaded in them.
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