A federal judge has given the go-ahead for a law in Colorado that prohibits individuals under the age of 21 from purchasing firearms.

A federal judge has upheld Colorado’s law that mandates buyers of firearms to be at least 21 years old. The decision came after a lawsuit was filed by Rocky Mountain Gun Owners and two individuals against Governor Jared Polis of Colorado.

The Chief U.S. District Judge, Philip A. Brimmer, supported the ruling of the U.S. Court of Appeals for the 10th Circuit. It was determined that age restrictions for purchasing firearms do not violate the Second Amendment, as they fall within a “safe harbor” exemption, thereby lying outside the purview of the Constitution.

Colorado’s law makes an exception for individuals serving in the U.S. Military and for peace officers. However, in these cases, the purchase must be made while on duty and in compliance with the respective agency’s policies.

A customer looks over weapons for sale at the Pony Express Firearms shop in Parker, Colorado, on December 7, 2015.  (REUTERS/Rick Wilking)

The decision in Colorado comes in contrast to one issued by the Supreme Court in 2022 in which justices determined that New York issued unconstitutional requirements for carrying a concealed weapon in public. Then-President Joe Biden said he was “deeply disappointed” by the ruling in New York State Rifle & Pistol Association v. Bruen. He said that SCOTUS had “chosen to strike down New York’s long-established authority to protect its citizens.”

“This ruling contradicts both common sense and the Constitution, and should deeply trouble us all,” Biden said in a statement at the time. He went on to reaffirm his commitment to reducing gun violence and making communities safer.

Brimmer is also going against a decision made by the New Orleans-based U.S. Court of Appeals for the 5th Circuit, which struck down a federal restriction banning the sale of firearms to anyone below the age of 21. That court held that those ages 18 to 20 are protected under the Second Amendment, according to The Trace, an organization of journalists who report on gun violence in the U.S.

A participant uses a handgun during a training session at a shooting range in Pompano Beach, Florida, on Oct. 25, 2023.  (Marie Uzcategui/Bloomberg via Getty Images)

“The federal government has presented scant evidence that eighteen-to-twenty-year-olds’ firearm rights during the founding-era were restricted in a similar manner to the contemporary federal handgun purchase ban,” Judge Edith H. Jones wrote in the opinion.

Several states, including New York, Massachusetts, California, Florida, Illinois, Delaware and Vermont have raised the age for purchasing firearms, according to the Everytown for Gun Safety Support Fund. While some states have limited the age restrictions to handgun purchases, others have applied the restriction to any kind of firearm.