Enhanced background checks and closing loop holes at gun shows only hurts one thing, total guns sales/profits. The amount of "designer" guns on market today is scarey. Many did not even exist 10 ago. Sadly one day there may indeed be gun control but when it happens it will be because the amount of guns in wrong hands is out of control. Logic would dictate that if you tighten checking today you might starve off tomorrows controls. As far as the 4.2 million, if the other 50 or 100 million want better checks the majority looses?
I guess that the 700,000 amateur radio operators should just get ready to turn over their useful radio spectrum to the far larger number of people who would like to benefit from new and convenient electronic devices that need spectrum too? Listening to some of the trash on repeaters and 14.313 leads me to believe that it would make sense to limit the amount of time that a transmitter can be active per day. Lets say 15 minutes. And a background check to purchase a transmitting device. Maybe that would keep lids in check? Heck, as hams we have absolutely NO Constitutional right to use the radio spectrum anyway.....
I wouldn't want that to happen to hams any more than I want gun owners to be burdened with useless regulation that will have no effect whatsoever on criminals.
Not sure what a "designer" gun is. My favorite designers are Samuel Colt and John Browning.