All very good points Captchee. I always liked that Moore with the detached pan and had considered making one like that some day. It would be rather easy to do, the only challenge is that the locks would have to be positioned and inlet PERFECTLY to ensure a proper pan/cover fit. As you stated, there were a few (very few) recessed breeches with rifle style locks, I only recall seeing one and it may be the Bowler that you mentioned (rings a bell) and it was a very low end gun and, yes, they require a longer breech to allow the relief required to be fully in the breech and not in the barrel. Every other SXS I've seen with rifle style locks had tapered breeches. To my way of thinking if you are going to go to the effort to build a SXS flint, you may as well make it as high end (in function) as you can. Locks as described for stepped breeches are available as castings from places like Dyson, Blackley and TRS and building those up into finished locks adds to the fun of building a sxs IMO.