Evening all. I have a post in the gunsmithing section regarding my Meriden 20 ga SxS that I've been working on. The biggest obstacle I have has to do with the firing pins. I'm hoping that someone here has some thoughts or info they can provide.

The gun was made around 1917 and it seems there's not a lot of information out on the web and virtually none for a 20 ga. I'm trying to see if I can get this to a point where I can use it but it needs some help. Who knows, maybe it will end up being a wall hanger. There are several parts that are missing besides the firing pins but I'll start my questions there.

I was on the Numrich site looking at the schematic for a Meriden gun to see what they showed for firing pins. I bought some parts off Ebay for a 12 ga gun and the firing pins I bought matched what was on their site. Well, it is now evident that not all parts interchange with the 20 ga. Here's what I bought (missing the spring) with the firing pin seat at the top of the picture.



Here's a shot of the receiver with the firing pin hole circled. Note that there are no internal threads for the firing pin seat (retainer) to screw into.



My best attempt at measuring the firing pin recess came up with this:



Wondering if anyone has seen anything like this? How is the firing pin retained? I appreciate any help that anyone can give.

Kirk