The Milwaukee Police are investigating a shooting that happened around 8:30 PM Friday.    According to the report, the 23-year-old man was shot while standing outside of a residence at S 6^th Street and W Arthur Avenue.   While the circumstances surrounding the shooting are being investigated by the Police, it is believed it may have been the result of a drug deal.   The MPD is seeking a suspect in the shooting.   The victim was taken to a local hospital for treatment of what is described as non-fatal wounds and is expected to survive.