Identification
Search by what it is called now, what it was called then, or your best guess at the spelling. All three resolve to the same entry.
Matches
The reference
The component itself, described once and linked to every arm it appears on. This is where the identification notes live.
Matched “upper jaw”, a recorded name for Top Jaw. Period, regional and trade terms are all filed against the same entry, so either word finds it.
Clamps the flint against the cock.
Matched “upper band”, a recorded name for Barrel Bands. Period, regional and trade terms are all filed against the same entry, so either word finds it.
Secure the barrel to the stock. Band count and style are major identification features.
Matched “upper tang”, a recorded name for Tang. Period, regional and trade terms are all filed against the same entry, so either word finds it.
Rear extension of the receiver into the stock wrist.
None of these it? Describe it to Butch — a photograph and a sentence is enough — or post it on the wanted board so a dealer can offer you one.