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I bought a couple of the Promags, but haven't had a chance to try them yet. They generally have good reviews.
I do have 3 of the original 25 rounders and one original converted 20 round M14 mag. I think I have 3 of the 11 rounders.
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So I got the Promags delivered. I didn't shoot them, but I have some US milsurp 7.62x51 dummy rounds. I loaded them up with 10 rounds and cycled them through. They both fed fine, except for the last round, which didn't feed from the mag.
The bolt just cycled over top of the round in the mag. Did this every time I loaded more than one round, or just loaded one round.
Interestingly, I did the same thing with a couple different of the IMI 11 round mags, they did the exact same thing.
Contrasted with the IMI 25 round mag, which fed all dummy rounds, including the last one.