I have handled probably 6 or 8 fullstock St. Louis made Hawken rifles over the past 37 years. none of them were flint.
I have seen only one full stock Hawken and that was years ago while visiting
Tom Dawson. He had the long bar trigger out of it and we both agreed that
it was made by taking the triggers from a smaller trigger bar and reinstalling
them in the long bar.The "pins" were apparently finishing nails.
There is no reason that the style of the caplock full stock Hawken can't be
incorporated into a flintlock rifle. It may or may not be historically correct
but it can be called PERSONAL preference.I have seen some very good looking
full stock Hawken styled rifles and nobody cared if they were HC or not.
I have made a number of locks for these projects over the years and there
was a good number of them made in the 70's and early 1980's.
Bob Roller