There was a machine gun that shot around corners?
Indeed there was, all the way back in World War Two.
Watch Ian from Forgotten Weapons tell us all about the bent barrel STG-44 Machine Gun.
The Krummlauf curved barrel is actually a clamp-on assembly that mounts to a Sturmgewehr STG 44 machine gun. There is an optical sight with a 30 degree mirror that allows the shooter to actually aim this contraption. This bent barrel device was very bulky and had a very short barrel life.