The gun buyers' fear is that in the future they might not be able to buy them without risking felony convictions. Most of the gang members, in contrast, aren't worried about the risk of a felony conviction because they already _have_ felony convictions and anyway are not in the market for the kind of jobs for which felony convictions are an obstacle.

You hit the nail on the head. Most guns owners are also law abiding citizens. Making something legal or not does not affect it's availability (think drugs and alcoholic).