Colorado lawmakers have passed a slew of new firearm laws in the dozen years since a major local mass shooting — with the bulk of them enacted in just the last five legislative sessions. Here’s a timeline of the major laws, along with several incidents that helped influence the drafting of them.

July 20, 2012: A gunman opens fire in a movie theater in Aurora, killing a dozen people and injuring 70.

Dec. 14, 2012: A mass shooting at Sandy Hook Elementary School in Newtown, Connecticut, kills 20 first-grade students and six educators.

March 20, 2013: During the Colorado legislative session following those incidents, then-Gov. John Hickenlooper signs three landmark gun laws : a 15-round limit for firearm magazines, a universal background check requirement and a new fee on gun buyers

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