Beautiful rifle AZshot! They apparently weren’t skimpy in the stock department.

Yeah, when I bought mine in the early 90s they were like $260 ordered new.  Or you could add $20 for extra fancy curly maple, which I did.  They were a very good value.

There are if I recall 2 moving parts.  The hammer and trigger.  You can open the sideplate to look at the action with 2 screws.  The hammer is attached to the mainspring with a loop.  The trigger is adjustable for a very light letoff. It's about as complicated as a letter opener.  Not sure how the "mechanics" can be bad, but the design is elegant.  The trigger, pins, and hammer were decent steel in mine.  Not much to break, and mine never has, but I've only had it 30 years or so.  

Update: just found a pic, haven't had mine open in 20 years and didn't want to take it down and spend the 2 minutes to open it.

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Back in the early 1970's I went into a local hardware store looking for a T/C Seneca and this store had a bunch of Mowrys from heavy barrel target rifles with some kind of peep sight and what looked to be a Lyman #17 front sight. He had a short barrel rifle I believed it was called a Coach gun and even had some DIY kits. The fit and finish looked well worth the price.i wound up buying the the Seneca for a few $$ more. Thanks for your post, it brought back some good memories. Maybe ASSRA should ressurect a BP percussion match, seeing as that's how Scheutzen matches got started. 

I'd have though that a bushing for the tumbler shaft on the action's hammer side would've at least minimized if not solved the wear problem.

Bill Lawrence