One of Colorado’s newest and most restrictive gun-control measures is facing a federal lawsuit from the Colorado State Shooting Association, the state’s official National Rifle Association group.

The lawsuit challenges the constitutionality of Senate Bill 3 , which was signed into law by Gov. Jared Polis in April. The measure will outlaw the purchase, sale and manufacture of many semiautomatic firearms that use detachable ammunition magazines starting next year.

The Mountain States Legal Foundation filed the challenge Tuesday on behalf of the CSSA and several individual plaintiffs who argue the measure violates their Second Amendment rights by limiting their ability to operate and obtain firearms.

The complaint claims, “because [the law] attempts to govern and regulate arms-b

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