The TKB-09 (ТКБ-09) was a

Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

delayed blowback assault rifle chambered in

5.45×39mm The 5.45×39mm Cartridge (firearms), cartridge is a Rim (firearms), rimless bottlenecked intermediate cartridge. It was introduced into service in 1974 by the Soviet Union for use with the new AK-74. The 5.45×39mm gradually supplemented and then ...

. It used a bolt attached to a spring in a tube above the barrel. The TKB-09 was intended to force the weight forward as means of increasing accuracy. TKB-010 was the variant chambered in 7.62×39mm.

References

{{Use dmy dates, date=June 2017 7.62×39mm assault rifles Delayed blowback firearms Trial and research firearms of the Soviet Union Assault rifles of the Soviet Union Tula Arms Plant products