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Post 2014, FN switched to a revised magazine design which is not compatible with the CMMG extension. I am trying to source a Gen 1 style for this reason, but the part number is the same between the two. I called FN directly and they said they may or may not have them, but aren't able to source it for me AKA it's luck of the draw lol. I bought my MK2 in 2017 and it shipped with Gen 1's, and that's 3 years after the revision... Just wanted to throw this out there if anyone has leads, and I'll buy a Gen 2 for trade as long as yours is comparable to "like new" condition.

Here's the difference in the mags - all it is, is that "V" in the front going down the mag.

 
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