A prominent gun control advocacy group is repeating its call for an immediate end to new sales of SKS rifles following the deadly shooting in Montreal on Monday.

Although police have not publicly confirmed which type of firearm was used by the suspect in the shooting that left Montreal police officer Mohamed Lamine Benredouane and civilian Michel Mizrahi dead, Radio-Canada has confirmed it was an SKS rifle — a semi-automatic rifle of Russian origin that dates back to the 1950s.

In a media statement Thursday, the group PolySeSouvient urged the federal Liberals to halt new sales of SKS models, saying it would close an obvious gap and send a clear signal.