That's been at the heart of the OP's original question and what most of the posts in this thread have been discussing. Assuming there was an evolution, are there American "transitional" rifles we can point to along that evolutionary process? The evidence of such is sadly lacking.
I thought about looking at it from another direction. Assuming that the American longrifle evolved from the short barreled German Jaeger, what evidence do we have of use or existence of short barreled German Jaegers in the American Colonies in the early 1700s?
Looking through Shumway's RCA Vol. 1 and in the chapter on German guns, I found he presented only two that showed use in America--#7 and #8. Neither of which have short barrels. RCA #7 has a barrel that is 39-7/8 inches long and the barrel on RCA #8 is 44 inches long. I would think that if Shumway knew of a short barreled German Jaeger that had seen use in America, he would have tried very hard to include it in his book.
I don't have a copy of Shumway's book on German guns that was basically a reprint of his "Longrifles of Note" articles in
Muzzle Blasts but I did borrow a copy from a friend and read most of it. I may be wrong as I'm working from memory, but I don't recall any short barreled German Jaeger with an American connection in it.
I would be interested if anyone is aware of short barreled Jaegers in the Colonies in the first half of the 18th century.
James Hanson in
Firearms of the Fur Trade wrote:
I started looking for archaeological evidence found at Indian sites that might have uncovered some of these Jaeger barrels. Typical sources such T.M. Hamilton didn't turn up anything. I did some internet searching and found a useful document, THE FUR TRADE AND HISTORICAL ARCHAEOLOGY A BIBLIOGRAPHY, Complied by Michael A. Pfeiffer (copy attached).
Based on Hanson's comments about rifle use by Southern Indians, I scanned the bibliography for papers about sites in the South. I didn't find much. I knew the fur trade in the South was predominately the deer skin trade with some minor trade in fur bearing animals, but was surprised at the small amount of academic research directed towards it. T.M. Hamilton wrote about several collections in the South that he studied, but evidently these were mostly collections from amateur archaeologists. The professionals appear to focus on pre-contact sites and antebellum sites.
I read in Shumway's
RCA Vol. 2, Chapter 18 about a rifle found at the Conestoga Town site not far from Lancaster, PA. This was the last town occupied by the Susquehannocks from near the end of the 17th century up to 1763 when the last of its inhabitants were killed by the Paxtang Boys. Shumway wrote that the archaeologists found
Note Shumway's bias concerning lengths of German barrels. At the time Shumway published the RCA books, Bob Lienemann hadn't uncovered the letters of Caspar Wistar showing he was importing in the 1730s rifles with barrels 39 and 40 inches long. This was an honest lack of knowledge on Shumway's part, but he made another error or typo in the quoted passage.
I had recalled reading in another book that the rifle barrel found at the Conestoga Town site was much shorter that the 41 inches that Shumway wrote. I racked my brain for several days trying to remember where I had read the contradictory description. I couldn't find it. In the end I gave up and ordered the book by Dr. Barry C. Kent that Shumway referenced. At the time Shumway was writing, it was an unpublished manuscript but has since been published by the Pennsylvania Historical and Museum Commission.
Dr. Kent wrote in his book:
Finally, some evidence of a sub-36 inch barrel Jaeger at or before the F&I War!
I continued to look through my books on Kentucky rifles and came across this interesting rifle in James Johnston's
Accouterments II.
View attachment 90274
View attachment 90275
Johnston believed this rifle was an Indian restock of a Jaeger rifle with a 24-inch barrel. Now we're talking...Or at least whispering.
Only two examples of Indian owned short-barrel Jaeger rifles is a little underwhelming considering all the Type G artifacts that have been found at archaeological sites and surviving whole Type G's.
Were the short-barrel Jaeger ever that common in North America? The evidence doesn't support the notion.
Is this the final nail in the coffin of the myth of the "transition rifle"?
excess650, I apologize if I misinterpreted your post. I agree "the longrifle was the product of mostly of German and Swiss immigrants." What doesn't seem to be supported by any evidence is the use of the term "evolved". The evidence indicates the the short-barrel Jaeger and the long-barrel Jaeger coexisted in the Germanic countries at the time those German and Swiss immigrants were coming to the colonies. The longer barreled German rifle might have been the preference in America from the get-go.