Canada stuck to their licensing agreement to the letter. It worked well for Sterling too because Canada also had to buy butt assemblies, Barrels, grips etc etc from Sterling.
As for the trigger mech....... There was always a bit of animosity between the two which were self contained and both tripped internally at a set point. Patchett always said that if his patent was written/worded in a slightly different way with a couple of words the Ruffell trigger would have breeched his patent