n. A very small gun.
1999
James Bond-style guns disguised as harmless cigarette packets are falling into the hands of villains. . . . Most of the micro-guns fire two gas pellets or two .32 bullets before they have to be reloaded. They can be effective at up to 20ft.
1998 (earliest)
Singapore Police are on the lookout for a new weapon available to international hijackers and terrorists — the micro-gun.