Restrict ammunition magazines to seven bullets, from the current national standard of 10. Current owners of higher-capacity magazines would have a year to sell them out of state. Someone caught with eight or more bullets in a magazine could face a misdemeanor charge.
In fact, this reminds me of some comedian I heard way way back when....
Dude gets pulled over in Montana for speeding...
Cop says "you know, we have a stiff penalty here for speeding. It's gonna be $5!"
Dude says "$5? Here's $20 and I'm speeding through your whole ****ing state!"