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Salesman Ryan Martinez clears the chamber of an AR-15 at Ready Gunner, a gun store in Provo, Utah.

Salesman Ryan Martinez clears the chamber of an AR-15 at the “Ready Gunner” gun store In Provo, Utah, U.S. in Provo, Utah, U.S., June 21, 2016. Massachusetts will ban the sale of “copycat” assault-style weapons similar to those increasingly used in mass shootings, state Attorney General Maura Healey, said July 20, 2016. REUTERS/George Frey/File Photo – TM3EC7K1DK101