This gives me an idea: if police can run gun buybacks, can't private citizens? What's stopping me from organizing an event where I buy back guns, no questions asked, to get them off the streets.
I'll pay $50 for any pistol, $75 for any long gun. Within a day, I'll have an epic collection of guns with history to show people.
"Yeah, so this here is my hi point that was used in a drive by, here's a Tec-9 from a bank robbery, oh, and this is a Raven MP-25 that was found next to a decapitated crack dealer. Pretty cool, huh?"