it means control of guns. That is, making sure that the people who have guns are competent to have guns and not idiots who will leave their guns out so that their 3 year old can kill their 2 year old.

In my opinion, you can have any gun you want as long as
1) you are licensed to have a gun passing some level of competency on use of guns and the laws surrounding guns,
2) the gun is registered and needs to be registered periodically
3) on a periodic basis you are tested to see if you are still competent to have a gun (this includes items such as having/using gun safes etc if that is the law in your state) and
4) you do not provide access to anyone who does not fulfill the same licensed and competent requirements: if you provide access to someone not entitled to access you are jointly liable for that person's actions while using your gun.

edit added
5) if you are found to be in violation of 1-4, you lose your right to any further access to guns until such time as a judge determines that your deficiency has been overcome