Senate Sends SB25-003 to Governor’s Desk

DENVER, CO – Today, the Senate sent SB25-003, sponsored by Senators Tom Sullivan, D-Centennial, and Julie Gonzales, D-Denver, to the Governor’s desk after voting to concur with amendments adopted in the House.

Beginning August 1, 2026, SB25-003 would implement and enforce Colorado’s existing law by requiring a permit and firearm safety training to purchase semiautomatic firearms that accept detachable magazines. The bill would also prohibit 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.”

“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.”

SB25-003 would allow 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 would not impact the sale of shotguns, commonly used hunting rifles, semiautomatic firearms that have fixed magazines, and almost all handguns. While SB25-003 would prohibit the sale of gas-operated semiautomatic handguns, the sale of recoil-operated handguns, which make up over 90 percent of the pistol market, would not be impacted by the bill. The bill would not impact the 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. Semiautomatic 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.

SB25-003 now moves to the Governor’s desk for his signature. Track the bill’s progress HERE.