Shortly after 5 p.m., police say the 49-year-old victim was in the parking lot of an East Side restaurant in the 4000 block of E. 106th Street when an unknown vehicle pulled up and a 19-year-old man armed with a gun got out and opened fire.
The victim then pulled out his own weapon and shot the gunman in the right hand and left foot, police said.
The 19-year-old was transported to the University of Chicago Hospital in good condition.
The 49-year-old victim was not injured.
Police say the victim has a valid Concealed Carry License.
The investigation is ongoing.