66 weapons and 31 ammo types, compared on the values the game computes with rather than the ones on the item card. Ranged damage is the ammo's base damage plus the gun's own add, so the same rifle firing AP rounds is a different weapon from one firing regular; quality moves it by a tier-tagged percentage on top.

The 15 damage perks and 11 weapon mods in the table apply after that, which is where most of the spread between two builds carrying the same gun comes from.