A Dover man has pleaded guilty to a federal firearms charge, after he admitted using a “straw” purchaser to buy guns for him because he was a convicted felon, authorities said.

Christopher T. Brown, 38, pleaded guilty in U.S. District Court in Concord to being a felon in possession of firearms and ammunition. He faces up to 15 years in federal prison and a fine of $250,000 at his sentencing on May 14, according to a news release from the U.S. Attorney’s office, which is prosecuting the case.