One other thing, it's possible the firing pin is broke and the tip is staying in embedded in the primer when the body retracts.  I still suspect an oversized firing pin hole and to small a pin.
It's not a particular difficult or expensive repair, but it does take someone who works on single shots a lot.
Good pictures of the block face and firing pin will tell a lot.
These guns have been around more than 100 years.  At one time they were cheap and every hack had a turn at them.  It certainly appears the one you have is worth getting right.

More pics

oneatatime wrote on Jul 16^th, 2024 at 7:40pm:


I'm not sure if I would know the difference. I removed the retaining screw and the pin doesn't seem to want to come out. I gave it some light taps with a brass punch but it's pretty well settled into the block.

I would agree with Dellet.  Not knowing if the pin was against the pin groove stops in the pictures I can’t say on the protrusion or retract position.  But, going by what is seen in the pictures, the pin appears to be extending to far and not retracting far enough.

Here is how I like to set up a firing pin.   

When retracted, like Dellet says, just below the bb face…retraction stopped by the pin groove against the retaining screw.

When the pin is extended and flush with the rear of the breech block, as if hit by the hammer, around .055 protrusion.  When extended I don’t want it to be stopped at the front by breech block or by the firing pin groove hitting the firing pin retaining screw.  The hammer stops against the breech block, which stops the forward pin movement.  The primer cushions the hammer blow against the bb.

From what I am seeing, I would make a new pin in order to have a better fit in the front hole of the breech block.  Although this could be troublesome.  Sometime the pin is smaller because the main pin body and the FP hole are not centered on each other properly, so people reduce the size of the pin, or enlarge the bb hole, or both, to get it to work freely in the bore.  Looking at the primer picture it appears the primer flow around the pin is offset, so this may be the reason for the larger hole.

Sorry, this is probably more than you really wanted to know!
Bob

Pin’s definitely bent.  I would replace it, see how it looks and if looks good try it.
Bob

This gets back to what I was saying about so called gunsmith monkeying around.  If you look at the front of the block, you can see a circle around the firing pin.  You can also see file marks all over the face.  I think the block has been bushed with a screw then filed for headspace and redrilled for the firing pin tip.  It's not parallel to the body of the firing pin.   
To get it to fire,  someone reduced the tip size and bent it.
It can all be redone and made right but it might be more cost effective to start with a new block.
If Gail at CPA is still there, I would call her and ask if CPA would do the work or her recommendation on who to send it too.
Sorry to be the bearer of bad news