Might the fact that the patrol model comes with a muzzle break is interfering with it's importation into Canada? I heard that State Department restrictions forced Ruger to produce an export model of the Gunsight Scout without the muzzle break and that the RFBs imported into Canada also had to come without flash hiders.
That would be a shame, as the combination of scope mounts and open sights on the Patrol would make it an ideal choice. The folks at Mossberg might have decided that it was easier to simply export the Varmint models to Canada than make an export friendly Patrol model.