Hi Michael,
I was hoping you would come in with a detailed description. Having had more time to look at the piece I get the impression that the lock may not be the first that has been on this gun. The attached photo suggests to my untrained eye that a large washer or a larger headed screw/bolt was once there but this may be as a result of the screw/bolt being replaced rather than an attachment for a different barrel, as I can see no evidence of a trigger guard ever having been fitted to the stock it gives me more hope that the stock may originally be of Scottish origin rather than continental. I have sent photographs to Mr Jonathan Ferguson curator of firearms at the Royal Armouries who is going to confer with Mr Robert Woosnam-Savage who co-wrote a book on Scottish firearms so hopefully definitive information may be coming soon. Many thanks for your kind words and interest.
Kind Regards,
Norman.
P.S. When I think about it the composition could be any combination of lock,stock and barrel
