TKB-059 (ТКБ-059) was a Soviet three-barrel bullpup assault rifle, capable of fully automatic fire, chambered for the 7.62×39mm round and manufactured by Tula Arms Plant in 1966. It was based on the Device 3B (Прибор 3Б), an earlier experimental assault rifle that also had three barrels.^[3] Both weapons were developed by the small arms designer Gennadij Korobov.

TKB-059
прибор 3Б
Type	Bullpup assault rifle
Place of origin	Soviet Union
Service history
In service	Prototype only
Used by	Soviet Union prototype only
Wars	none
Production history
Designer	Gennadij A. Korobov
Designed	1962–1966
Manufacturer	Tula Arms Plant
Produced	1966 (TKB-059)
Variants	Device 3B TKB-059
Specifications
Mass	3.85kg [1]
Length	690 mm
Barrel length	430 mm
Cartridge	7.62×39mm
Caliber	7.62mm
Barrels	3
Action	Gas-operated
Rate of fire	1400–1800 rounds/min[2]
Feed system	60-round or 45-round detachable box three-row magazine
Sights	Iron sights

Both the TKB-059 and the Device 3B used a specialized 7.62×39mm magazine with three columns, akin to three individual box magazines placed and attached side by side. There were two sizes of magazine: one with a total capacity of 45 rounds (15 rounds per column), and one with a capacity of 60 rounds (20 rounds per column). Each barrel was independently fed from its corresponding column.^[1] The TKB-059 could be fired ambidextrously as the spent cartridge casings ejected downwards behind the magazines.^{[citation needed]}

The TKB-059 prototype can now be seen at the Tula arms museum.^[4]