More photos of SP guns may be found
Personal photo of SU-6 there
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Hi AMVAS, I have a few questions for you, or anyone else for that matter.
1. Do you have any information about BT-4 production?
2. In the gun production table, you mention a 37mm M1944. I am unfamiliar with this gun do you have any more information?
3. Could you recommend a source with photographs of the Su-6?
PS - excellent site and getting better all the time!