There's little harm in the bill our state Assembly just passed, to expand gun buyback programs across New Jersey. It comes at no cost to the taxpayers. It would be paid for with forfeiture funds and private donations.
They don't directly target the guns that are more likely to be used in violence, and in general, the guns collected haven't overlapped much with crime guns. These are old weapons that some middle-aged guy found in his basement. What criminal is going to trade in his $700 Bushmaster for $250 from the state?
The biggest problem with this approach, though, is that it tiptoes around the one reform that could really make a difference, but that Americans would never accept: Mandatory gun buybacks. That's what Australia did, after its own version of Newtown.