The Brief Mayor Brandon Johnson signed an executive order Wednesday aimed at tightening standards for companies that sell guns, ammunition and accessories to the city. The move builds on the city's broader gun violence reduction strategy, including the recently created Office of Gun Violence Reduction. Mayor Brandon Johnson signed an executive order Wednesday morning that tightens how the City of Chicago purchases firearms, gun accessories and ammunition for city departments and sister agencies. Chicago tightens firearm purchasing standardsThe executive order is designed to ensure taxpayer dollars are spent only on firearm vendors that demonstrate strong legal compliance and responsible business practices. Earlier this month, the mayor signed an executive order creating Chicago's Office of Gun Violence Reduction.