That is a gross misrepresentation, Kevin.   If someone has been convicted of terrorism or terroristic activities or associations, they will be on the NICS list and denied the right to purchase a gun.   If someone has been adjudicated to be mentally unstable, they too will go on the NICS list and be denied.   Some bureaucrat deciding that I might be a terrorist shouldn't give them the right to interfere with my right to travel by putting me on the watch or "no fly" lists or interfere with my right to keep and bear arms by putting me on the NICS list.   If they want to deny my rights, they can afford due process and we can take it to a judge and jury.   We haven't become the Soviet Union quite yet.