Do all weapon mods work on all weapons?

Question

Do all weapon mods for a class of weapons work for all weapons of that class? For example, does the Assault Rifle Piercing Mod work on a M-37 Falcon?

If the answer is no, is there a list of all incompatible weapon mods?

Note: I think the answer is no, because I don't think the SMG Heat Sink works on the Collector SMG (as of January 5, 2013).

Answer 1

They work for all non-DLC weapons at the least. I don't know about DLC/special weapons like the Collector SMG however. They may be special, but any normal gun purchased/unlocked in the main story is compatible with all weapon mods of that class.