Nightfox -
I probably could have been a little clearer.
I meant that if he US were to adopt safety-based gun laws, those laws can also impede the flow of arms into the hands of gangs etc. Most countries already do this, and it is not difficult.
For instance, by tightening border security and rules concerning the import of weapons.
HIGHLY unlikely to have any effect, since "outlaws" don't care what laws you pass (that's why they're outlaws) and they don't need to import weapons since the U.S. already has significant domestic weapons production not to mention guns are not that difficult to manufacture illegally especially when you have working models to copy.
It's a case of analyzing how gangs acquire weapon, identifying the seller or origin, and then closing down that pipeline as much as possible. It won't work 100% of the time, but it can work a lot of the time.
This is a bassackwards approach to the problem, if one wants to actually address the problem of gun violence then one needs to understand the root causes and attack those. I can tell you one thing for certain, guns aren't the root cause of gun violence, they're just the means. Adding/changing laws is only going to serve to impede law abiding citizens from acquiring/owning guns, criminals don't care about the law so it's not going to deter them in the least, in fact it's just going to make the illegal trade in weapons more lucrative and thus more attractive.