Collectors tend to refer to them as "curio & relic" rifles.
firearm
old Bess
Old Betsy
A carbine, if it's short enough.
Old Bang-all
As in a PERSON sniper = Marksman Weapon= rifle?
Impossible to answer without the name of the maker.
Impossible to answer without the maker's name.
You did not provide the sn or maker name. As a result, the questions can't be answered.
musket Or miguelet / miquelet.
Long gun, smoke pole, thunder stick, etc..
Impossible to answer without the name of the maker.