Thanks all for information on this interesting rifle.
#1 The reason I asked if it was original or contemporary was, " If it was contemporary that it may be a chance that you can get new parts for it by the maker, Or someone who has the parts!
# 2 If not, then we make parts if needed!
the gun does need new lock bolts as the threads are stripped, which could partly be the reason why it does not fire the lock ( it's a weak click ) the tiny spring that holds the front trigger forward does not seem to have any strength in it as for holding it forward!
I am not a machinist, least I don't have all those fancy milling machines and lathes to make parts, most what I have is hand tools! I do use a few power tools like a bandsaw and sander, and drills.
Those lockbolts have an unusual head, I did look through my supply of blank lockbolts and none were long enough to go through that thick stock, I did found that a 10/32 thread will fit in the lockplate on the rear side, the front is of a different diameter more like a 8/32 but it still had some grip, about half worn.
So I would think some of these minor issues could be fixed with the right tools and materials, and go from there!
It would likely be a great shooting rifle, but sure is heavy to carry in the woods, didn't weigh it but feels like 15 pounds!
HAVE A GREAT DAY!