the FEP has gen 2 thermal and quote on quote “better protection”, but thats all i know
oh and i have documents of it so if they do wanna add M1A1 FEP in the future then id bug report it if its necessary
The FEP would have armor about on par with the M1A1 HC. The main upgrade was to the FCS.
and gen 2 thermal, basically fire control/electronic stuff