A federal judge on Wednesday refused to block a Colorado state law limiting the capacity of ammunition magazines, KMGH reported.
U.S. District Judge Marcia Krieger would not issue an injunction because the law had already taken effect, according to KMGH.
Sheriffs from 54 Colorado counties -- most of them rural and gun-friendly -- filed a complaint in May in federal court in Denver, arguing that the ban on magazines holding more than 15 rounds violated their Second Amendment rights, according to KMGH. The suit did not seek an injunction against a background check provision in the same law.
Some Colorado lawmakers are facing recall efforts after supporting recent gun control legislation.