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Compatibility: Smith and Wesson M&P 15-22 Factory 10 and 25 round magazines, Pro-Mag 15-22 Magazines
Posted by arthur on 11th Jul 2013
will work well on 25rd mag will not work with CA restricted 10/25rd mag not unless you want to split them apart and glue them back together. will try to put them on reg S&P M&P 15-22 10rd mags nice upgrade.
(1022armory.com comment - there are instructions on how to more easily remove the pin using a screwdriver and a hammer that doesn't involve splitting the magazine. See the instructions page for the specific instructions)