I bought a handful of small parts 5 years ago to restore a G1 that I got out of an estate sale, stripped and in a ziplock bag. I remember getting a hinge pin, and a couple of minor springs and pins, from BellM in the USA, without issue. I'm not sure if that is still possible.
Even then, the locking lugs were an issue. I want to upgrade one of the barrels I have to split lugs, but can't find anyone selling them to Canada.