Video: A close-up of the world's smallest gun

With a size no bigger than a nail, the world's smallest gun can be worn on the finger like a jewelry.

Le Petit Protector is a French ring gun of the 19th century, extremely rare. It consists of a small revolver revolver mounted in the ring and metal body ring with the word "Le Petit Protector" engraved in silver.

Le Petit Protector - The world's smallest gun.

This tiny gun uses 4mm bullets and can fire bullets while still being worn on user's fingers. According to Guns.com, guns can produce a loud explosion when firing bullets, but produce a small force, just enough to penetrate one side of the tin box.

Le Petit Protector is being auctioned online and is expected to bring its owner over $ 2,000.