A Dorchester man pleaded not guilty in Roxbury District Court Monday to charges including unlawful possession of a firearm, after Boston police found a loaded gun in his car during a motor vehicle stop, the Suffolk district attorney’s office said. Christian Isaac, 28, is facing charges of unlawful possession of a firearm, unlawful possession of ammunition, carrying a loaded firearm, possession with intent to distribute a Class D substance, and failure to stop for police, Suffolk prosecutors said. He was arrested Friday after police received a call that a man was waving a loaded gun in the area of Kendall Street in the South End.

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