This weapon idea is called saw launcher. It is a legendary barrage or heavy weapon that fires sawblades that bounce of walls and other surfaces. If done in enclosed hallways it can shred through enemies. It first still fires in a straight line, but as I said, it will start bouncing off walls when contacting walls and other surfaces. Another perk is that it will pierce enemies and shoot through them. But as long as ur not in a cramped hallway, it can't do toooooooo much.