1. This isn't the hexagun. 2. The hexagun is the fastest "gun" in the game. Yes the damage is a bit lower but it's very decent for the speed in which it fires.
I think it's weird that there's this gun and the hexagun. It's weird that corsair's gun is used by both rng and cor and the hexagun is used by just cor. Idk...it's just strange to me.