Are you looking for background or specs, arc?
Oleg Grigoryev listed some details on the Avtomat Sudaeva AS-44 (OAS), Avtomat Bulkina AB-46, and Avtomat Dement'eva AD-46 (or KB-P-410). http://forum.axishistory.com/viewtopic.php?f=79&t=31808
Weight (full mag):
AK : 3,62/3,71kg
Dement'ev : 3,75/3,78 kg
Bulkin: 4,04/4,03 kg
Sudaeva: 5+ kg
Length:
AK : 874/652 mm
Dement'ev : 895/690 mm
Bulkin : 875/677 mm
I think those specs came from here (scroll to the bottom): http://www.sinopa.ee/sor/bo001/bo04av/bo04av01/ispit01/ispit01.htm
Lots more photos there as well of the Bulkin, Dement'ev, and Sudaev -- fixed-/folding stocks and stripped.
For the Korobov TKB-408, see: http://world.guns.ru/assault/as73-e.htm
SA Korovin bullpup (image only) - http://world.guns.ru/assault/korovin-1945.jpg
Does anyone have details of the AR-46 by Col. Rukavishnikov (presumably a scaled-down SVR-38)?
Attached, an ugly image of the AS-44 with bipod fitted.