There is a lot of variations and modern rules old timers didn’t follow.
Early made rifles tended to be bulkier. Virginia rifles tended to be plainer then Pennsylvania rifles, rifles from north Carolina plainer still
Later guns tended to slim. Ohio guns became very dainty.
Brass was popular on early guns, Iron became popular in the south. Silver became popular north and south after 1800.
Many outgrown rifles were brass and silver mounted. Few Pennsylvania guns were in iron. Few guns mixed metals.
Robust guns would reappear for western fur trade and movement. Some of these guns were dainty
Where ever you see a ‘rule’ you will find exceptions.
Saying ‘Kentucky Rifle’ will Mark you as a ‘green horn’ as it’s well known that Kentucky rifles were made in Pennsylvania..... except the large numbers made in Kentucky although Boone’s rifles came from Pennsylvania or Virginia or maybe Maryland.
And we almost ignore Delaware and Connecticut made rifles.
Half stocks would become popular after 1800, full stocks made through the whole of American rifle making.
You can scream augggghhhhh now and start pulling out your hair.
Me after years of studying American rifles