This is a good reason to test all your mags with your rifle and mark them in some way. I have both 2nd and 3rd gen p-mags that will work great with one rifle(my 15T), but not so much with some of the others(sport & 300BLK). Its weird which ones choose to work. I cant tell any difference between the design of the area where the catch grabs onto the mag. But there is something.
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15T,15-22,5946 & some not S&W
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