Police were summoned to Le Skratch bar and pool hall at the intersection of Pierrefonds and Sources boulevards at around 2 a.m. ET Friday.
"Two customers had a conflict, and the conflict turned bad when one of the customers — the suspect — [took] out a firearm and [shot] in the direction of the victim," said Montreal police spokesman Const. Simon Delorme.
The victim is in hospital with a bullet wound to the upper body. Delorme said he is expected to recover from his injuries.
Delorme said the victim is known to police.