For forty years, Alexander Perfiliev has been making miniature model firearms. They're duplicates of the actual designs (such as the Makarov pistol pictured above) scaled way, way down. English Russia reports that they actually work. We've seen functional miniature guns in the past, so it wouldn't surprise me in the least.
Link via Technabob | Photo: Lesnyanskiy
(BTW, a small spelling correction: the pistol is a "Makarov", not "Marakov").