Smallest gun, non-live ammunition

In 1997, goldsmith Gunasingham Sarangan, from Jaffna, Sri Lanka (now resident in London, UK), fashioned a handgun from 22 carat gold measuring 2.8 mm (1.1 in) long and 2.3 cm(0.9 in) high. The gun can be loaded with bullets 0.4 cm(0.15 in) long and weighing 0.2 mg. The piece took a year to make. The gun cannot fire a 'live' round as scale limitations restrict the amount of cordite that could propel a slug out of the chamber and along the barrel.

This is also a pistol.