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AR15.COM
4/19/2013 6:04:40 PM EDT
What did they change when they went to the X?
4/19/2013 6:35:02 PM EDT
[#1]
Supported chamber
4/19/2013 6:50:46 PM EDT
[#2]


more supported chamber and slightly different magazine followers.

4/22/2013 9:32:11 AM EDT
[#3]
Also read that the FNP chamber was designed to NATO specs and the FNX was redesigned for more variance for all types of commercial ammo, at least for the .45 model. Although it's not a common problem, there are a few threads about KABOOMS with the FNP chamber.