You mean to say certain assault weapons?
No one is suggesting we should take away second amendment rights to own guns...
I don't think there is a second Amendment "right" to own guns.
In fact, there are no "rights" and never were. There are privilages society lets you have.
Anyone who thinks he has "rights" needs to look up "Japanese-Americans, 1942" to watch how fast "rights" vanish.
So the question is, under what circumstances should society allow you the privilage of owning a firearm?
My opinion, if you don't need it as part of your business or work, you don't need one. But if you are going to allow it, a gun should be like a car. You should get licensed, insured and registered if you are going to have one and you lose your privilages if you abuse them.
If the gun owners are going to claim no gun law is going to stop Adam Lanza without violating their privilage to own guns, then, yeah, then we need to take everyone's guns, because the cost of this privilage is too high.