This tank was equipped not only with 45 mm guns. Let’s go by chronology and caliber.
Russian Zedval releases kits for an early two-turret modification with machine-gun armament
N35019 Set of parts for the T-26 mod 1931
I will skip the rest of the machine gun kits, because I will have to drag the entire line of Degtyarevs’ tank here. I’ll do it someday, but in the “Machine Guns” edition.
And then we have a unique set from ModelPoint
MP3571 37mm PS-1 barrel
The same two manufacturers did not pass by the flamethrower version.
35127 Barrel Flamethrower OT-26
N35033 Set of parts for the OT-26
MP3572 Flamethrower Barrel OT-26
I did not find trunks directly for the self-propelled gun, but for the cannon version there are a lot of them. Honestly, I copied this line of barrels from my kitography for multi-turret tanks from the T-28 and T-35 assortment. And there were:
from Spanish Jordi Rubio
TG-51 76,2 mm. KT-28 Soviet tank-Gun
Russian Magic Models
MM3552 76 mm barrel 1927/32 (KT). T-35, T-28 (early), BT-7A, T-26A
where Magic Models, there is her forerunner – ModelPoint
MP3503 76 mm KT-28 barrel
and there is also another well-known Russian manufacturer – Zedval
35008 76 mm gun barrel KT-28
with traditional kits
N35009 Set of parts for the T-26A
And finally repackaging from the Russian Мир Моделей
C35002 76mm tank gun barrel for T-28, T-35, BT-7A, T-26A