Not if due process is employed. It's not impossible, the mechanisms exist. But it is madness to refuse to consider limiting the ability of known terrorist sympathizers to get guns.
Due process???? In this current post-Constitutional government????
No list is going to stop Jihadists from getting weapons to kill us.
Lists are only going to stop law abiding American citizens from being able to buy, keep and bear arms.
PERIOD.
Screw new lists. Screw new "mechanisms".
If we were serious about liberty - we would be demanding all gun restrictions be lifted and advocate the American people arm themselves up, because it is clear that we are on our own when it comes to self defense.