A 22 year-old Dorchester man allegedly shot and wounded a man outside of Ashmont station on Wednesday evening as stunned commuters watched and ran. Balfour McLean was arrested near the scene of the 7:30 p.m. incident by members of the Boston Police Drug Control Unit who happened to be nearby and witnessed McLean running from the scene. McLean was arrested in front of a home on Alban Street, about two blocks from the shooting, which left a 24 year-old Randolph man suffering from a gunshot wound to his abdomen. He is expected to survive, according to the Suffolk County District Attorney’s office.

McLean was arraigned Thursday in Dorchester Court on charges of armed assault with intent to murder, unlawful possession of a firearm, unlawful possession of ammunition as a subsequent offense, carrying a loaded firearm, possessing a firearm with an defaced serial number, discharging a firearm within 500 feet of a dwelling, and being an armed career criminal. The latter charge stems from prior convictions in 2011 and 2012 for possessing ammunition and drugs with intent to distribute.

Boston Police recovered a 357 revolver in the yard of a house on Alban Street next door to where McLean was caught. “It was found to contain two spent rounds and three live rounds of ammunition,” prosecutors later said. McLean was ordered to be held on $150,000 bail.

McLean is due back in court on Sept. 15.