Patrick: If you read that thread right through to the end you will see opinions expressed that that barreled action may have been dropped into another stock, possibly with it's original lock. You will also see that I said in my post that "to my knowledge" all Mk III...were new manufacture. Anything is possible but I am a specialized Snider collector and, in my research, haven't come across any info that would support your assertion. Snider collecting is different from many other more modern types of rifles. Even on the BMF forum you rarely see talk about how to determine originality of individual Sniders. The fact is that most ordnance issue Sniders have either serial numbers or assembly numbers stamped on many parts at the factory and certainly didn't originate as "mixmasters". My own large-ish Snider collection includes examples that can be demonstrated to be probably all original and others that clearly had replacement parts installed during or post service. With a fairly small number of individuals collecting Sniders (and many of those not disassembling their examples) there is a lot of info that has yet to be published about them.
Ridolpho