I am not kidding here. The Violence Policy Center has an FFL here:
1730 Rhode Island Avenue NW #1014
Washington, DC 20036
Their number is 1-54-000-01-8C-00725, and it checks out as being valid through 2014. Seriously, give them a call. If they're not in the business of dealing in firearms, the ATF might like to have confirmation.
Sometimes it’s nice not to destroy the world for a change.