(FILES) In this file photo taken on May 22, 2021, a Glock 17 pistol, or handgun, is displayed during a gun 'buyback' event held by the New York Police Department (NYPD) and the office of the Attorney General, in the New York borough of Brooklyn. - A dozen people were killed and about 50 injured in shootings across the United States over the weekend, after President Joe Biden last month branded the ...