You might try using your AI mod anyway, in addition to TMR's AI module. My friends and I use FFIS and the two play very well together, no issues of any kind.

It's advertised that all of the MX rifles are able to use the 100rnd belts, but the MXM appears to be an exception. I tried using TMR without any other mods and with all modules, except for Core and SmallArms, removed, but no dice. The other four MX rifles can use the belts as advertised, though the MX SW's usable ammo is listed in the wrong order in both VAS and the Virtual Arsenal compared to the others. Is restricting the MXM to the 30rnd mags intentional?