There has been a push for tougher gun laws in Colorado since the Columbine shootings just 13 miles from the movie theater massacre.
One father who lost his son at columbine says not enough has changed to toughen gun laws.
"It makes me angry," said Tom Mauser. "It makes me sad for America that we have other countries looking at us saying, 'What is going on there? Are you people nuts?' It's not just the assault rifle. It's these magazines that can hold thirty, fifty, a hundred rounds that make it easy for people like this."
"You can't stop selling guns," said gun owner Andrew Wright. "If you're going to be in an armed country you're just going to have to deal with the occasional fruit loops. That's just the way it goes. It's unfortunate."
After Columbine happened in 19-99, Colorado passed a law requiring gun shows to run background checks on buyers.
But there is no state ban on assault weapons or high-capacity ammunition clips, no background checks for online sales and no limit on the number of guns you can buy.