The deceased is Selim, 40, son of late Abu Taher, of Bhobarber village.
According to the police and locals, two groups of drug dealers locked in a clash around 6am on Tuesday.
During the clash, both groups exchanged fire, leaving one of them dead on the spot.
Officer-in-Charge of Benapole Port police station Apurbo Hasan said Selim was accused in more than a dozen cases.
Police recovered his body and sent it to the Jessore Medical College Hospital morgue for autopsy.
A foreign-made pistol and two rounds of bullets were recovered from the spot.