James,
Nice job on the short one!
I am always in more than two minds about poacher's guns.
Yes, those you show from the museum likely are, but English and such with a skeleton stock, I don't think so.
I mean, when did a poacher have money to get a gunmaker to build him one? (some poachers were Very good with throwing sticks)
The ones I have seen are nearly all for sure coaching carbines, short and light and carried for security, along with a brace of pistols. Griffin made a good few of these.
Thanks for the photos, James!!