TKB-408 was a precursor to which heavily-modified Kalashnikov rifle as selected by the Red Army?
TKB-408:  It was created by German A. Korobov and submitted to a set of official trials conducted in 1946 to select an assault rifle for the Red Army. TKB-408:  None of the designs submitted to these trials were selected, although the AK-47 that was later adopted was a heavily modified variant of Mikhail Kalashnikov's AK-46. AK-47:  It is the originating firearm of the Kalashnikov rifle (or "AK") family.
i don't know