Part of the confusion about these issues arises from assertions by at least one person early on, extrapolating from US experience, that these murders were just a typical, ordinary robbery/murder and that it is easy to purchase a stolen gun anywhere in Canada.
On the upside, we are now beyond that kind of thinking to something more in accordance with reality.
Glad the post helped.
I'm pretty sure that robbery was behind the murders. ID and presumably wallets were stolen at the first two murders, and I think the Rav4 was stolen at the third murder. ID was taken from all victims to delay discovery of the victims and provide suspects with more time to distance themselves.
It would not surprise me if they had a street gun or stolen gun.