Wouldn't something like this make it easier to flag straw purchasers who funnel guns into the hands of folks who shouldn't have them? From what I've heard folks more knowledgeable than myself on this issue say, a large part of gun violence is abetted by straw buyers legally purchasing many guns, specifically handguns, in a short period of time in areas with lax gun laws a short distance away from places with stricter gun laws, and then funneling those legally purchased guns to folks who shouldn't have them. It seems to me that keeping a record that a gun purchase was made, without detailing what specific gun was purchased, would allow straw buyers to be identified better.