the 10 and 15's are the same size. The 10 has some plastic block thing in the bottom half to limit capacity.
I have 2 15 round marked mags and 2 14 round marked mags (ie it has holes to count 15 or 14 rounds total in the magazine drilled in the side and stamped), but they all hold 15 rounds. Odd...
I was able to squeeze 15 th round into 14 rd. mags, but it was always tight. I am sure by re-working the follower (ala Beretta 17 Rd. mags) you can increase the capacity by a round or 2.
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