Members of Rapid Action Battalion (Rab) in separate drives recovered one single-barrel gun and 570 grams of heroin here on Friday night. Acting on a tip-off, a team raided Raikhani village in Biswanath upazila and recovered he gun from near a pond in an abandoned condition at about 10:00pm. In another drive, the elite force recovered 570 grams of heroin from old railway station in the city at about 10:30pm.