The argument, as its been explained to me, is that enacting stricter gun purchasing laws will raise prices and ultimately availability of guns sold illegally to criminals. Therefore having fewer guns in the hands of criminals. Isn't that what we all agree is the end goal? I have yet to hear a pro-gun argument that addresses a desire to keep guns out the hands of criminals.
The prospect of tighter gun laws insinuates the foot-in-door technique used by politicians, they will pass one little law, then another, then another, until guns are totally outlawed and all gun owners are on a public registry (see HR127)
I mean for fucks sakes I'm against tighter gun restrictions for law abiding citizens, I live in a very loose state and still hate the magazine restrictions, too bad I lost all of my magazines in a tragic boating accident

but I still believe something needs to be done to keep ARs and glocks out the hands of psychos and gangbangers. Who disagrees?
Also to whoever posted about 3D printers firing high-tech guns, if you mean inaccurate single-shot plastic derringers, then yeah that's pretty high-tech