5.5 cm long Swiss mini gun The world's smallest revolver

 
The Swiss mini-gun has been named the world's smallest and most effective revolver by the Guinness Book of World Records.

According to media reports, it is 5.5 cm long, 3.5 cm high and 1 cm wide, while it weighs 19.8 grams. The import of Swiss mini-guns has been outlawed, but despite its unusually small size, it is as deadly and effective as any normal-sized double-action revolver.