I have a Russian SKS with the number "BU3597" scratched into the barrel. I was trying to trace this rifle, to maybe learn more about its particular history. And thought that this might be a service number of some sort.
My research hasn't gotten me very far, I haven't even been able to find out how the service numbers were assigned, or if this even is a service number. Anyway, I was hoping someone here might be able to help me.