Would any of you gentlemen have a photo of a Boss O/U action with the stock removed, showing how the firing pin is retained? The marked area in the pic, only with parts in place. Thank you

There seems to be a screw recess in the shellhead cavity just behind the fences. Could that screw be the firing pin retainer?

Actually this seems like a very compelling suggestion. I've always assumed that the screw was a gas vent like the one Purdey SxS have in a more forward position, but your theory makes more sense

How about telling us about this gun? It's magnificent!

It's the bicentenary gun. This picture I believe is from the shop of the engraver. If you google Boss bicentenary Gun you'll see a few more photos.

Any more input?

If you have a Facebook account you might try posting on the best guns member group. These guys seem to know their Bosses.

https://www.facebook.com/groups/bestgunm...155959338818180