SB25-003 Signed Into Law

DENVER, CO – Today Governor Jared Polis signed into law SB25-003, sponsored by Senators Tom Sullivan, D-Centennial, and Julie Gonzales, D-Denver, and Speaker Pro Tempore Andy Boesenecker, D-Fort Collins, and Representative Meg Froelich, D-Englewood.

Beginning August 1, 2026, SB25-003 implements and enforces Colorado’s existing law by requiring a permit and firearm safety training to purchase high-powered firearms that accept detachable magazines. The bill also prohibits the purchase and sale of all rapid fire conversion devices, like bump stocks and binary triggers.

“High-capacity magazines are what put the ‘mass’ into mass shootings, which is why over a decade ago Colorado Democrats passed legislation to prohibit magazines that hold over 15 rounds of ammunition,” said Sullivan. “This legislation is another in the list of policies I have worked on to develop evidence-based solutions and reduce gun violence of all types. The people of Colorado have mandated that we do something about the public health crisis that is gun violence, so that’s what we’re going to do.”

“Semi-automatic weapons and high-capacity magazines have been used far too many times to terrorize Colorado communities,” said Boesenecker. “The trauma, grief, and loss due to mass shootings are felt deeply in our communities, and as a former public school teacher and a parent of three children, I worry daily about the safety of some of the most vulnerable Coloradans. With this legislation becoming law today, we will help save lives and prevent future tragedies in Colorado.”

“Gun violence continues to have devastating effects on Colorado communities, and we must do more to protect lives,” said Gonzales. “The firearm industry’s profits come, time and again, at the expense of public safety and something has to change. Senate Bill 3 is about holding firearm manufacturers to account, ending the industry’s profit motivation, and enforcing the law we have had on the books for more than a decade. I’m honored to join Senator Sullivan on this legislation and in his work to reduce gun violence in Colorado.”

“Semi-automatic weapons paired with high-capacity magazines result in a much greater loss of innocent lives, which is why we must fully enforce Colorado Democrats’ decade-old law banning high-capacity magazines,” said Froelich. “Coloradans deserve to grocery shop, go to school, and worship without worrying about being a victim in the next mass shooting. This gun violence prevention law requires that all firearm purchasers complete a rigorous safety training course and acquire a permit to purchase the most deadly weapons on the market to ensure that they are not a danger to themselves or our communities.”

SB25-003 allows a person to purchase a semiautomatic firearm with a detachable magazine after undergoing a background check and completing a firearm certification course that includes information on safe gun usage, federal and state firearm laws, de-escalation and crisis intervention strategies, range time, and more.

The bill does not impact the sale of shotguns, commonly used hunting rifles, semiautomatic firearms that have fixed magazines, and the majority of handguns. While SB25-003 prohibits the sale of gas-operated semiautomatic handguns, the sale of recoil-operated handguns, which make up over 90 percent of the pistol market, are not impacted by the bill. The bill does not impact possession of currently-owned firearms.

In response to the 2013 Aurora theater shooting, Colorado Democrats passed legislation that prohibited the sale and transfer of magazines that hold more than 15 rounds of ammunition. Semi-automatic weapons and high-capacity magazines have been used in numerous mass shootings in Colorado, including the 2021 Boulder King Soopers shooting, the 2022 Club Q shooting, and the Columbine High School massacre.