No, Jorge, they don't. But the FBI/Dept of Justice publish a report every year about it. Why don't you go look it up? Because I'm certain you wouldn't otherwise, let me help you.

Straight from the DOJ:
"According to the 1997 Survey of State Prison Inmates, among those possessing a gun, the source of the gun was from -
a flea market or gun show for fewer than 2%
a retail store or pawnshop for about 12%
family, friends, a street buy, or an illegal source for 80%."

Here's another:
http://www.ojp.usdoj.gov/bjs/abstract/ffo98.htm
In 1998, 40% of those charged with firearms posession offenses in the U.S. were already barred from having a firearm (probably because they were already a Felon)

and another:
Almost half the defendants charged with a possession offense between 1992 and 1999 were charged with using a firearm during the commission
of a violent or drug trafficking offense (18 U.S.C. § 924(c)). Of those charged with a possession offense between 1992 and 1999 –
• 44% were charged with unlawfully possessing a firearm based on their status as a prohibited person (18 U.S.C. § 922(g))
• 8%, receiving or possessing an unregistered firearm (26 U.S.C.§ 5861(d))
• 3%, possessing firearms with altered or obliterated serial numbers (18 U.S.C. § 922(k) and 26 U.S.C.§ 5861(h))
• 3%, possessing stolen firearms (18 U.S.C. § 922(j)) (appendix table 3).

In 1994, the DOJ said that young people with illegal guns account for 74% of street crime committed.
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In my opinion, all this blather about whether or not firearms should be legal can be cleared up with the statements of some notable Americans.

"The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." -Thomas Jefferson-

"Americans [have] the right and advantage of being armed -- unlike the citizens of other countries whose governments are afraid to trust their people with arms." -James Madison-

"The Constitution shall never be construed to prevent the people of the United States, who are peaceable citizens from keeping their own arms . . ." -Samuel Adams-

"The best we can hope for concerning the people at large is that they be properly armed." -Alexander Hamilton-

"The very atmosphere of firearms anywhere and everywhere restrains evil interference -- they deserve a place of honor with all that is good." -George Washington-

I'll second that one, George. Guns deserve a place with all that is good.