Gun retailers failed to show that limiting their stores to certain locations violates the Second Amendment rights of their would-be customers, a federal judge has held.In a written opinion, U.S. District Judge Robert M. Dow Jr. rejected a challenge to zoning restrictions that Chicago’s gun ordinance places on commercial firearms establishments.These geographic restrictions do not unduly burden the right to possess arms for self-defense, Dow wrote.“While preventing a firearms retailer from setting up shop at a …