One photo to sum up what all of us are thinking...
No amount of restrictions will eradicate crime. Murder is already a crime, seems like Adams wasn't too concerned with that... What makes anyone think his evil plan would have been averted by more restrictions? Here's a few that I can debunk without batting an eye...
"Assault weapons ban"
As another poster pointed out, the AWB banned certain features, none of which would have prevented this guy from inserting one or several magazines.
"Longer waiting periods"
This guy planned this insanity months in advance... Plenty of time to acquire plenty of guns... Not an effective restriction..
"Magazine capacity restrictions"
These ideas do little to effect the outcome of someone intent on doing harm. A few more magazine changes and you get the same number of rounds sent down the tube... Restricting capacity will only affect the law-abiding, since the guy was intent on killing people, methinks he wouldn't have cared about violating an arbitrary capacity law.
"Ammo restrictions"
Won't work. As someone else mentioned, he planned this thing for months. Any level of somewhat 'reasonable' (I hate that term) restrictions on ammo quantity would have been moot. He would have had plenty of time to acquire enough ammo to carry out his plan.
Agree with others here, this will be a battle cry for Bloomberg, Brady, and others but will amount to not much more than that. Any further restrictions can be easily debunked and a complete and total ban will not happen.