Yes, a great book as is the supplement.
I acquired a set when I bought an early John Manton percussion (1825).
I’ve learned a lot..
Checkering first appeared about 1775 (pistols)
1/2 Stock long arms about the same time (50 yrs before Hawken)
Competition for new ignition (Perc cap won in the early 1820’s.
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Lots of info!