I think this would be nice because sometimes firing thru a window at a weird angle can just be annoying and thing would help to shoot things thru windows that are at a weird angle, this could be a attachment that could be placed on all common guns but not on special guns like why would you need a laser on a rocket launcher or flamethrower?
#laser attachment
winged notch
compact trench
Maybe just your standard gun types, but ya, sometimes that was a pain...