I'd like to do something like this first, on a mass scale.
Anybody who is good at photoshop might want to take a try at creating an image for a sticker similar to this one. This traditional "Navy Jack" flag has flown on the bow of every USN warship since 9-11 (without the rifle of course.)
Other rifles could be substituted, such as scoped hunting rifles, Garands, M-14s, full-stock AR-15s, whatever.
These would make great car stickers. Even if you simply print them at home and tape them inside your back window down low, they can be very visible and effective in making our point. We need to show our numbers, this might be a way. "Sore-Loserman" showed how effective home-printing can be at disseminating an image nationwide.
To make the point clearly to the obtuse sheeple at the red light behind you, perhaps the sticker could also say "THE SECOND AMENDMENT" or "KEEP AND BEAR ARMS" or such across the top, in the same print as the "DONT TREAD ON ME" across the bottom.
Thousands or possibly almost millions of these on cars and other places could make a difference. Paint the dispute in sharp relief, show what the stakes are to millions of Americans.