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what is problem, it was just a tech demonstrator plus prototype named SC-129 (some say it was named STs-129), though receiver clearly has "TKB-0145" written on it which was originally an experimental 6x49mm sniper rifle project forked from bullpup version of SVD, i already covered it up here in previous post herenot much info is available about this SC-129, i think they reused TKB-0145 receiver on making this prototype here; and this time making it in another experimental (now in use) cartridge 12.7x55mm
This SC-129 most likely got developed further into post-soviet Russia as ShAK-12 bullpup .50 cal "assault rifle"
in fact; during late 80s Soviets themselves tried to develop a rimless intermediate calibre round in 6x49mm "Unified" to potentially replace their standard 7.62x54mmR and ALSO made a PKM derivative AND a Dragunov derivative in that calibre;
top to bottom; 5.45x39mm, 6x49mm 'Unified' and 7.62x54mmR
top to bottom; sniper rifles TKB-0145K, SVK, SVK-S; later twos being Dragunov derivatives
top to bottom; a PKM derivative in 6x49mm ;Unified; left-right sides and one production model at some museum, and actual 6x49mm belt with some prototype ammos; notice how it's very MG-42-ish non-disintegrating link belt made for push-type cartridge feeding mechanisms unlike one on actual standard PKM
so even Soviets were going ahead with proper redesign of PKM in late 80s-early 90s; might as well guess that even they realised all these things regd muh rimmed reliability etc and decided to go ahead with something more practical; but unfortunately for them disintegration of the USSR ruined everything from this true intermediate calibre and weapons for that to mighty Buran space shuttle
Again, tech demonstrator prototype from same Tula Design Bureau, named TKb-408 Korobov, named after its legendary designer German Korobov, this and other similar looking but internally different bullpup assault rifles from Korobov actually competed against Mikhail Kalashnikov's AK-47 during those adaption trials, but eventually Kalashnikov's AK-47 won owning to its simplicity and all otherwise who knows we may have seen soviets and Viet Congs and all BTFOing various capitarist swines wielding a ;space age; tier Korobov bullpup rifles
all these rifles TKb-408, TKb-517, TKb-022PM,TKb-059 three barreled bullpup rifle were bullpups and designed by Korobov, all in 7.62x39mm
there was another TKb-011 bullpup in 7.62x39mm designed by Nikolai Afanasyev
in fact Korobov had also made a conventinal, delayed blowback action rifle named TKB-517 which superficially resembled Kalashnikov design minus bulky gas tube part; was also trialed against later production AK-47 but eventually Mikhail Kalashnikov's one prevailed and in some years we got AKM
later in 70s, TKb-0146 was developed by Igor Stechkin (of that Stechkin APS pistol fame) which was also a bullpup rifle but in 5.45x39mm
TL;DR:
these aren't ugly, they are just sovietly blyatiful rifles
and as always quite a shameful for us that despite both INSAS and QBZ-95 starting their official service in armed forces of both respective countries we never did this much upgrades attempt on our guns except very very recent things where FAB Defense guys had to offer an upgrade kit and yet that was not accepted here while they...khair chhodo
