Is the trunnion for the Russian/Bulgarian sidefolders different than the standard stock trunnion? If so, what does it look like and where can I find one :D
Yes the trunnion for the Russian and Bulgarian skeleton stock (and the folding synthetic model) is different from the standard trunnion. Kvar did have just the trunnion but try to buy the stock and trunnion assembly together, it'll be less expensive that way.
Make sure it comes with the the latch hook and spring that hold the stock in the closed position.
It has an oval push-button on the right side and the hinge is on the left side.
Also you'll need a receiver cut for that particular trunnion, or have to do a lot of cutting on a standard receiver.