Note that Colorado already has the trifecta of gun control measures being pushed.
Universal background checks
Magazine limits
Red flag laws
... and still a mentally deranged (sudden jihad syndrome) person was able to pass a background check and carry out a mass shooting with limited magazines.
What ultimately stopped this bad guy, was a good guy with a gun. The reason that the number of dead was so high is because there were not more armed citizens who were prepared to stop the guy.
The call should be for MORE guns,