The previous assault weapons ban. My thoughts in parentheses.
Semi-automatic rifles able to accept detachable magazines and two or more of the following:
Folding or telescoping stock (aids in concealment not actual weapon ability to kill)
Pistol grip (looks cool, does nothing to enhance killing ability)
Bayonet mount (really that is an issue)
Flash suppressor, or threaded barrel designed to accommodate one (nothing to do with weapon's efficency)
Grenade launcher (to date no grenades have been used, nor are they available to purchase)
Semi-automatic pistols with detachable magazines and two or more of the following:
Magazine that attaches outside the pistol grip (does not aid in reloading or weapon fire power)
Threaded barrel to attach barrel extender, flash suppressor, handgrip, or suppressor (again only cosmetic does not reduce the weapon's efficiency)
Barrel shroud that can be used as a hand-hold (no one holds an semiautomatic pistol by the barrel)
Unloaded weight of 50 oz (1.4 kg) or more (huh? are lighter weapons more deadly?)
A semi-automatic version of a fully automatic firearm (OK )
Semi-automatic shotguns with two or more of the following:
Folding or telescoping stock (aids in concealment, but so does a hacksaw in stock and barrel)
Pistol grip (again looks cool, but does not make it more deadly)
Fixed capacity of more than 5 rounds (most have 7-10 shot tube magazines which would be legal without grips or folding stock)
Detachable magazine (to date no mass murderer has used a auto shotgun with detachable magazine)
Pump shotguns which are the number one type of shotgun used along with sawed off double barrels are not considered assault weapons. So none of the rules apply to pump shotguns and sawed off have been illegal for decades.
Assualt weapon bans are really moot anyway. In all the cases of mass shootings over the last 100 years only 26% to 35% of the guns used (depending on your definition) were assault weapons. Most were either shotguns, pistols and standard hunting rifles including .22 cal. George Hennard in 1991 killed 24 and injured 44 people in the Luby's massacre in Killeen, Texas. He was able to rack up this level of carnage with two pistols before killing himself. Thomas McIlvane, in the 1991, Royal Oak postal shooting killed 5 and injured 5 with a .22 cal. rifle used for squirrel hunting. In both cases no assault weapon was used.
John Steward said it best, "there is no defense against crazy" We can either live in fear or accept the fact this is and has never been a perfect world and get on with our lives. No amount of laws, restrictions on freedom, banning guns or changing the constitution will change the fact some people just want to kill. Maybe the media and free speech are the problem, but I would be the last to call for restraints because that would be unconstitutional.