Currently in the base game, LMGs are bugged such that you can replace mods in place, and that LMGs with more than one mod slot don't function correctly, only allowing one mod at all. This is because the weapon type was missed in the script that populates weapons with viable mod types. All this does is fix that bug, so LMG mods work normally.
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Literally all this does is fix the LMG mod bug. Probably not compatible with any other script mods that mess with what mods can be put on what weapons, since it overrides that function.
I wrote this in like two seconds and tested it for two minutes.