Today's march follows pro-gun rallies all over the country.
Supporters say just because they're armed doesn't mean they're dangerous.
Nancy Jackson of Littleville, Michigan said, "Don't put us in a category with bullies and thugs. We're not. We're everyday citizens protecting our families."
2nd Amendment March Founder Skip Coryell said, "We're not coming here with guns."
The organizer says this rally will be peaceful. Respecting D.C.'s ban on handguns, but promoting the constitutional right to bear arms.
"The second amendment has nothing to do with guns; nothing to do with guns. It has to do with freedom," said Coryell.
But one constitutional expert says the wrong group is bending Washington's ear today.
Elizabeth Wydra of the Constitutional Accountability Center said, "It should be the gun control advocates who have not really gotten a lot of movement from this administration or Congress."
The Obama Adminstration has allowed guns in national parks and on trains. The Supreme Court is expected to rule soon on whether state and city laws have to follow the second amendment.
But in D.C., where guns just led to the city's biggest mass shooting in nearly two decades, there's concern about fewer restrictions.
Nardyne Jeffries, a victim's mother, said "My child barely weighed 100 pounds, shot with an AK-47. Go to see her, neck all wide open, bullets all in her body. It's just senseless."
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