a heater
A gun, usually a handgun, that feels like it’s going to melt your hand off after you shoot it a few times, like a gangster from the 1930s.
That heater I used to shoot the cops was so hot, my fingers looked like they were on fire.
My uncle had a heater that he used to shoot people, and it left his hand looking like a burnt pancake.
That heater was so hot, I thought I was going to lose my thumb.