The TKB-506 (Russian: ТКБ-506) was a small handgun designed to look like a cigarette case, developed by Igor Stechkin, allegedly on the orders of the KGB.
Weighing 0.44 kg empty, it could fire three 7.62 mm rounds, each held in a separate barrel only 2.5 cm long and each having a separate striker.
Device number 10 can now be seen at the Tula arms museum.
[2][3] TKB-506A had an identical armament, and similar weight of around 0.47 kg with ammo, but was even smaller (7.4 cm height) by doing away with the cut-through hole used for the trigger in TKB-506.
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