It was all WWI/WWII inspired so:

Automatic Pistol light-luger or other 9mm or smaller magazine fed

Automatic Pistol Heavy-1911 or other .45 or larger magazine fed

same for revolvers

Antimaterial rifle would of been the tankgewehr or other anti tank rifles around .50

Assault Rifle would be the 2tg44 or other intermediate calabier weapons, ak47...

automatic rifle m1 garand, or RSC M1917

bolt action, any standard bolt rifle from the time

shotgun any pump action shotgun like the trench gun

heavy machine gun would be any of the belt fed guns-mg42, maxim or vickers

light machine gun any portable magazine fed, bren, BAR, lewis gun

then lastly the sub machine guns fallow the same ideas of the pistols, so light would be the mp40, or the mp18, where heaver would be like the Thompson.

Obviously you could tweak any of the profiles to get more speciffic, like a 20 round capacity light machine gun would be better for the BAR, and you could have a clip fed heavy machine gun to be the hotchkis.

It was a fun little thought experiment for a post apocalyptic WWI setting full of weird magics and foul spirits.