MINNEAPOLIS (AP) -- Three young adults have filed a federal lawsuit alleging Minnesota's minimum age of 21 to carry a gun is unconstitutional.

Kristin Worth, Austin Dye and Axel Anderson filed the action Monday. They argue the minimum age of 21 for a gun permit is discriminatory since anyone at least 18 years old is considered an adult for most purposes.

Three gun groups _ the Minnesota Gun Owners Caucus, Second Amendment Foundation and the Firearms Policy Coalition _ have joined the lawsuit.

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