Musket laser rifle, ugh I can't even right now. The game seems more interested in modifying guns with things that make it literally go father back in time (water cooled barrel for the assault rifle) Modding firearms doesn't make sense as modding a receiver magically makes a barrel shoot some new caliber
First off the zip guns or 'pipe guns' in the game lack any viable sense to me other than to blow your hands off. I'm a bit of a gun nut and every time I looked at the firearms in Fallout 4 I had to scratch my head.