Different versions of this ring pistol shoot different ammo. The one above shoots a 5 mm bullet.
There is also a version below that shoots bb sized matchlock musket balls and fired with blasting caps or blasting powder
Hand engraving on the side of this 18th century version of the ring gun/pistol
le petite protector. The fashionable and deadly ring pistol used in the hit t.v. series femme fatale.
A six shot version of the ring pistol. R. M. Maylett designed the smallest pistol of the time and originaly was not created to be a ring pistol and the cut out hole was merely the best way to get a firm grip on such a small gun
labeled as a spy gun but I think it would be very noticeable and almost impossible to aim this tiny thing. Definitely a close range weapon.