Twenty-one states are asking a federal appeals court to overturn provisions of Maryland's gun-control law that ban 45 assault weapons and limit gun magazines to 10 rounds.
West Virginia Attorney General Patrick Morrisey led the coalition in filing a friend-of-the-court brief in the 4th U.S. Circuit Court of Appeals in Richmond, Virginia, last week.
The brief says the law violates the Second Amendment right to keep firearms in homes for self-protection.
The other states are Alabama, Alaska, Arizona, Florida, Idaho, Kansas, Kentucky, Louisiana, Michigan, Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Carolina, South Dakota, Texas, Utah and Wyoming.
A U.S. District Court judge in Baltimore upheld the provisions in August.
The state of Maryland has until Dec. 31 to respond to the filing.
