Hello Bulivyf, did not mean to imply that you did anything wrong, just taht I wish Real Model had done up the most common version...their fault, not yours.
The version you have is the initial mock-up...the gun is really just a metal tube, it does not fire. It was very exciting to see at the time and many people guessed that there would be a 50mm autocannon on it. Once the operational test version came out, it had the standard 2A42 30mm autocannon on it, which makes sense for urban fighting on that turret design.
However, you have done a excelletn job with the kit, keep up the good work. What Russian - based armor will you do next?