China has a dictatorship of the proletariat. The Red Army is the armed wing of the proletariat. The bourgeoisie is disarmed.
I think the USSR had local people's militias, but that made a lot of sense given the context of the invasions they faced.
Individual gun ownership is not necessarily helpful for a revolution, and exists for the historical purpose of primitive accumulation and enclosure with guns being a means to protect property of individuals. The proletariat collectively owns so the defense of the people's organized property should also be organized, in general. The disarmament as an exercise of force should be done by the terms of the proletariat.