I grew up with firearms, I started learning to shoot when I was six with a .22 air rifle and have continued since. It seems that the general assumption is that in the U.S., an individual can simply go out and purchase a .45 pistol. Uh-uh. Mandatory pistol safety and marksmanship classes, registry and ID, background check, and then a much more intensive course if you want a concealed carry permit. Fact is, there are parts of my hometown I don't want to go anywhere near without at least a knife, preferably something more substantial.
Yes, illegal firearms are a problem. But you outlaw guns, people are still going to purchase them, and now almost all of them will be off the radar. Furthermore, in rural areas, farmers often need rifles, shotguns, etc. as a matter of expediency. A single herd of deer can ruin an entire crop.
So, if you speak of gun control as outlawing firearms, I oppose it. If you speak of it as regulating firearms, then I support it. Your question is inappropriately vague.