As far as I know, all of them - USSR, Cuba, China, Vietnam, NK etc, implement gun control. Why should their governments do that? The people of these states genuinely support(ed) socialism, if they are/were all armed they can protect socialism far better than the 1% of the population that makes up the military.
These statistics show people own guns? Gun culture is quite different from the US around the world. The State not forcing a gun into your hand is not them banning you from owning one