The rings are a Jap Bushnell, best available at the time, and I still use them on one rifle, metric wrench of course.
I would not take the trigger off until you try it for function. Flush with lighter fluid from the top, working the sear up and down with your finger if the sear is stuck .
I bet the rifle will be a real shooter as it is.
I would not be surprised if the stock was used on a 40X, then the gunsmith fit the panda in the stock at a later time. I have never seen a Panda that did not have a trigger hanger, and I have a very early panda. Remove the trigger guard and look at the bottom of the action to see if there is a trigger hanger.
You may have a wild cat 6ppc.
Best wishes!
Keith, I used to have an early Stolle that I gave to my best friend. It did not have a trigger hanger.
