Colorado’s attorney general argued Monday that the state’s ban on large-capacity gun magazines is constitutional, effective and a reasonable use of government power.

Attorney General Phil Weiser, a Democrat, filed the state’s legal brief in Rocky Mountain Gun Owners v. Jared Polis, a case before the Colorado Supreme Court that could end the 2013 ban on magazines larger than 15 rounds.

“Courts have recognized that magazine limits do not disarm citizens or ban an entire class of weapons,” Weiser wrote in a 52-page brief, filed with the court late Monday. “Rather, a wide variety of weapons, including handguns, remain available; nearly all semi-automatic weapons operate fully with lower capacity magazines; and citizens may use multiple magazines.”

In April, the high court agreed to consider the constitutionality of Colorado’s ban on magazines that hold more than 15 rounds. Rocky Mountain Gun Owners and the National Association for Gun Rights argue the ban infringes on the right to bear arms under the Colorado Constitution.

Requests for comment from RMGO and the NAGR were not answered Monday and Tuesday.

The Colorado Court of Appeals and a district court have found the ban is permissible under the state Constitution. It became law in 2013 as part of gun reform efforts that followed the 2012 Aurora theater shooting, in which the shooter used a large-capacity magazine to fire more than 60 bullets in less than a minute.

Weiser has urged the Colorado Supreme Court to evaluate the state constitution, not the U.S. Constitution, when determining whether the magazine ban is constitutional. The state constitution guarantees the right “to keep and bear arms in defense of (a) home, person and property.”

“Trial testimony from several witnesses indicated that neither citizens nor law enforcement face self-defense situations where they use anywhere close to 15 rounds,” Weiser wrote. “Nor does the large-capacity magazine ban limit in any meaningful way the type of firearms Coloradans may purchase.”

On Monday, the cities of Denver and Boulder sent the Colorado Supreme Court briefs in support of the state government’s position. Denver’s decades-long ban on large-capacity magazines was upheld by the Colorado Supreme Court in a 1994 case.

“By prohibiting the sale of large-capacity magazines, (the ban) is a reasonable, and reasonably tailored, attempt to address this serious public safety concern — and thus constitutional,” attorneys for the two cities wrote of the statewide ban.

Oral arguments in the case have not yet been scheduled by the Colorado Supreme Court. It’s also unclear when an opinion will be issued by the high court.