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  1. FN Five-seveN Accessories
    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...
  2. FN Guns and FN items For Sale
    USED CMMG FNH FiveseveN 10 Round Mag Extension Kit (Item # 10202) I bought this just to try out, but found out that you need to sand and debur the magazine interface to get this extension to run reliably and I didn't want to mess with that. The extender and spring were used for maybe two...
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