José.
*EDIT*: I forgot... What kind of machine gun is the coaxial gun in the T-34? The only thing I know is that it is 7.62 mm cal.
*EDIT 2*: Here's a pic I've just taken:

The entire gun mount has to be scratchbuild... The base kit? A Tamiya T-34, not the best kit, but cheaper than a Dragon T-34,and it has the Uralmash turret (I really like this turret), there are no other simmilar kit in 1/35.