The plate is a common type of universal aftermarket plate that was available at one time. I have a bunch of them in my “junk” drawer. I think it may have been something that bishop offered.
I also do not think the buttstock is original to the gun.
The pin punch marks on the bottom of the barrel lug was some hacks attempt at tightening up the fit of the barrels in that area. I could show you some wowsa examples of this type of work. Also in the junk drawers.
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B. Dudley
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