Gun control, as we know it, consists of the government restricting an individual to purchase weapons. The different types of gun control vary from waiting periods between when you purchase the gun and when you actually get it, background checks so that criminals can't purchase guns legally, and completely banning certain types of guns. There are countless ways for criminals to avoid these government regulations, causing them to stop innocent citizens from protecting their home and family's.
The "waiting period" method of gun control is basically a two-step process. The first step in the procedure is that the person wanting a gun goes to his local shop to place the initial order. Then, he must wait one to two weeks while the government performs a background check for past criminal activities, and mental stability. During this time, if the purchaser of the gun wanted the gun to go kill someone out of rage, it is hoped that they will not still want to cause harm after a couple weeks.
The problem with this method of gun control is that it stops the ordinary citizen from purchasing a gun, but it actually protects the common criminal. So if a burglar enters a house with full intention to kill an innocent person (who can't get a gun to protect his family because he was arrested for drunk driving seven years ago) his victim is also a victim of gun control laws. There are over 200 million registered guns in circulation and they are the ones that will not be used in killings.
Another practiced technique of preventing dangerous firearms from killing innocent people is to ban an entire type of weapon. The AK-47 is a common example of that. The criminals have limited access to the weapon through underground deals but these banned weapons are so powerful that there really is not a practical purpose for them in the home (or in hunting).
Even legal weapons can easily be modified by the common criminal who knows anything about the way guns are assembled. A semi-automatic machine gun can be converted into a fully automatic gun with a little work. A shotgun can become a more powerful weapon by sawing-off the tip of it.
Obviously, new methods of gun control are needed to produce better results. If we continue to monitor the sale of firearms, there must be new techniques that can watch where the guns end up.