The Worlds Smallest Revolver

At just 2.16-inches, the SwissMiniGun is the world’s smallest functional revolver, complete with ammunition — shoots tiny 0.35-inch long bullets. Product page here.
This miniature Swiss-made revolver and its ammunition are painstakingly crafted using watchmaking technology. Looks like the little shooter could do some damage, propelling that tiny slug at 426.5 f/sec. out of the muzzle.