The Supreme Court on Friday left in place a longstanding gun restriction in the District of Columbia that bans magazines that hold more than 10 rounds of ammunition, opting once again to avoid taking up a new gun rights case.

The court, which has a 6-3 conservative majority that generally favors gun rights, turned away a challenge to the Washington, D.C., law just a few days after rejecting an appeal over a similar law in Rhode Island.

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Then, the court also left in place Maryland's ban on assault-style weapons including the AR-15 semiautomatic rifle.

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