The Nail Gun Massacre (1985)

"Forget about that guy with the chainsaw. And start worrying about the deranged Nail Gun Killer!"

Following the brutal rape of a young woman by a gang of construction workers, a mysterious figure wearing a motorcycle helmet and driving a gold hearse begins hunting the perpetrators down. The masked avenger's weapon of choice, obviously, is a nail gun, with which he (or could it be she?) takes out the rapists one by one. Just who is this murderous vigilante?