nut behind the bolt

English

Etymology

Punning use of the word nut to refer to a fool, rather than a mechanical nut. Implies that most firearm accidents are the responsibility of the shooter and not a failure of the gun.

Noun

the nut behind the bolt

1. The person using a firearm; the shooter.

   He said the accident was caused by a faulty trigger, but I think it was the nut behind the bolt.