I personally think this is a terrible idea. There are such things as thugs with money to spare, I'm certain there are plenty of violent drug dealers with enough money to buy an AR15, something that I don't have.
Actually, no offense, but I think this is about the WORST gun control proposal I've ever heard. The whole microstamping business actually sounds good compared to this.
EDIT: Our gun laws are at about the most effective level they are ever going to reach right now, absolutely NO new gun laws are going to make gun crime decrease significantly. The rabid gun-hating morons in the Anti-gun crowd need to realize this, consider it a job well done for themselves, AND SHUT THE HELL UP.
Sgt. of Marines, 5th Award Expert Rifle, 237/250
1st Award Expert Pistol, 382/400
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011