A witness reported seeing a man pointing the weapon at a man from a car at the junction of Maxwell Square and Leslie Street, around 5.10pm.
The suspect is described as being white and wearing a black jacket with a white logo, on the sleeve.
Glasgow gunman hunted after BMW drive-past firearms incident in Pollokshields
The other man is described as being white and about 55″ in height. He was bald and was wearing dark clothing.
Police Scotland say a thug in a grey BMW pointed a gun at a man during a stand-off at the junction of Maxwell Square and Leslie Street.