Rapid Action Battalion (RAB) members detained a suspected arms trader in Muksudpur upazila of Gopalganj on Tuesday night.
Detained Farhad Hossain Sheikh, 40, is a resident of Charprasannadi village in the upazila.
RAB-8 Madaripur camp in-charge Mohammad Tajul Islam said on information, a team of the elite force conducted a drive in the village and detained him red handed with a one-shooter gun.
During initial interrogation, he confessed to his involvement with drug business, said Tajul Islam.
Muksudpur Police Station officer in-charge (OC) Shaker Mohammad Jubayer said a case was filed in this connection on Tuesday night and Farhad was produced before a court on Wednesday.