Yep, part 20, actually three parts: trip/spring/pin. Held in place from below by part 13, cocking slide. The pin facing downward with pressure from the spring slides into the little indentation in the cocking slide upon opening. The top part of 20 (trip) by the little spring's pressure slides into the half-moon notch cut into the bottom of part 15, "Square top bolt." Without the cocking slide in there it would not work at all.

Of all the parts on a Parker that are a universal size and almost always need replacing, I wish someone made a repro of these three parts by the thousands. Most every gun could use new part 20. While we are wishing, would also love new roll pin screws (18), especially the heads. The other end of the screw can be reworked but the heads are time consuming and difficult to fix.

I defer to your experience, and you're right on. I have been inside these guns alot, but lately I've noticed my CRS medication not keeping up.

Is there a way to tell if the parts you mention are missing without taking the action apart? Not sure I want to attempt disassembly.

An interesting thing to notice in your photos is that the trigger plate is not sitting flush with the frame in the front up by the dolls head portion. This is a good indication that something may be put together incorrectly on the inside.

The two screws in the guard is a shame. Looks like it may have been done when the stock was replaced. Maybe whoever did it was having a hard time getting the back of the guard tang to lay down. Other than that, I canno think of a reason as to why. That could be corrected by welding up and grinding back down the rear hole.

The gun has some nice heavy plumb patina. You usually don't see them worn that heavily.

The Gun is a V grade, making it lower on the value scale. But it is certainly worth getting back into safe shooting condition.

People often fail to clean the frame groove and trigger plate before replacing the trigger plate. Invariably, there is old oil in the gap, which when the trigger plate is put back on, gets pushed into the inside corner, preventing the trigger plate from seating at the correct depth.

Nice gun regardless and hope it finds the good gunsmith it deserves

Thanks for all the help. I think I have decided I will need to ship it to someone for repairs. I spoke with Larry DelGrego and with Dewey Vicknair. Sounds like either one of them could knock it out. I am looking forward to getting the gun back in shooting condition.

I also have the old tags from the gun. Here is a picture.

Just curious- The tag says the RH barrel targets 125 pellets and the left targets 220 pellets. Does anyone know what this corresponds to in choke? i.e. modified, imp cyl, etc?

That's about Improved and Modified.