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#2!!!! I’m one who loves diverse builds. Seeing a new rifle or smoothbore that has been designed and executed by the builder is exciting for me. I understand that some coming into the craft only know of a few styles and only from available kits. I have turned Kindig’s Golden Age book and the Rifles of Colonial America into raggedy old books, studying originals for over 40 years I guess. I recommend books like that, which offer a look at many different styles.
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I completely concur, Rich, with your ideas about studying the originals. Those books are golden for anyone who is, genuinely, interested in longrifle history. IMHO, the information from the KRA's DVDs and thumb drives might serve as an introduction to a new student/builder, to cut his teeth on, before investing in the books you mentioned.
IMHO, for someone who doesn't know the first thing about Longrifle architecture, the Kibler kit guns can be used as a pattern for drops and cast off, presuming the kit's stock fits the novice builder, if for nothing else. And, while the Kibler kits are not original pieces, they can be used as a reasonably accurate substitute, for study by someone who does not have access to original pieces.
As an addendum for the OP, you might check out the "Grumpy Gunsmith of Williamsburg's" youtube channel, for more good tutorials.
J.D.