The right of the People to keep and bear arms shall not be infringed. The problem, as pointed out up-thread by others, is who is deciding which folks are not allowed to buy a gun. Put in a mental health provision and tea partiers, people posting on freerepublic.com and people opposed to Obamacare will be declared unstable and denied a God given right.
Short answer is no, we have a right, pre dating the Constitution, to keep and bear arms. Felons get guns on the black market, steal guns or use other tools if guns are not there. Cain killed Able with a rock.
Use a little logic. The places with lax gun laws, like Texas and Arizona, have less gun violence than Chicago, New York and DC where legal guns do not exist. But somehow in DC, where a spent .22LR case nets a $1000.00 fine and jail, there is lots of gun crime.
A Navy facility with metal detectors, armed guards and the strictest gun laws in the nation left all those people defenseless. Paper laws do not stop bullets.
I did not suggest that a doctor could inform the NICS & then these people would be unable to get a gun, period. I suggested that it would simply FLAG that individual for a follow-up. If there is legitimate evidence that the individual is deranged/not connected to reality, then a court hearing could be called to judge the situation.
My question stands: do you want to block the those who are clearly a danger from getting a gun? How is it best to do that?
We already have a background check system. With a simple addition, we might be able to stop the next Gabby Giffords event. And it would be simple to build in protections so that doctors who abuse their authority are punished.