They've got a petition and free bumper stickers. I'm tempted to order a bunch of free swag just to throw it away. It'd be fun to waste their money. http://www.regulateassaultweapons.org
Be careful you don't become a statistic they use to show how much support they have for 'common sense civil rights violations'.
They have a contact tab. Someone should write them a nice letter informing them that "assault weapons" (true full auto rifles) are already highly regulated and restricted.
I'd do it but I'm not very articulate when it comes to things like that. I'd just end up telling them to eat a whole bag of d***s.