Perhaps it is time to try a different approach. Let's go after those that DON'T enforce the current laws on the books. Start with Police Officers that merely confiscate contraband (drugs, guns, etc) and don't enclude these items in their arrest reports. Move on to Prosecutors that don't charge "special circumstances" (using gun while comitting other crime), and then by filing complaints on Judges that give the old "slap on the wrist" sentences for crimes involving guns.
Crack down on Dealers that are more interested in profits than following the laws that govern them. Nail a few "Straw Man Purchasers" that buy their guns in states with liberal laws, only to transport them to prohibitive states to be sold from the trunk of their car. Hey, maybe if the "prohibitive" states were to drop their restrictions and let the guns be sold legally then there would be less of a Black Market. Do you think?
It makes me choke to say so but Nancy Pelosi had a point when she suggested that there would be no more new gun laws from the current congress, there were enough already that just needed to be enforced.
Maybe it is time to eliminate Plea Bargaining and other forms of leniency when it comes to gun crime, using only those laws already on the books.