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Welcome to the forum GGun. I hear the John Masen, and Promags, compare about the same. For more info enter John Masen Mags in the search section you will get all related posts.
 

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I have five of them and have not had a misfeed/fail to feed from any of them. The bolt lock after the last round is fired also functions with the Masen mags. The first one I bought would only latch after a lot of manipulation. I contacted Masen and they knew about the problem, took the offending mag back and replaced it from a new batch. (They had some QC problems with the latching tab being located to low.)
 
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