Major Joel,
My locks are made the same way as those made in the time when they were state of the art.They are bench crafted as a one of a kind custom job. used what I thought was the best materials for the job and were readily available.I used cast EXTERNAL parts.plate,cock,rop jaw and frizzen and frizzen spring.I used the Chet Shoults Ketland,Russ Hamm Maslin and a Ketland of unknown origin which was the best of the 3 IMHO. and that' the one in the picture.Most of there preferred the flint to be flat side down.I sold it as a Ketland because a man I shot with had an original rifle with an identical lock that was plainly marked Ketland.The flintlock rifle I finished in 2008 used one of these locks and it went off like a caplock.The moulds that produced these parts are now in the estate of the late Jerry Devaudreuil who lived in Wooster Ohio.
These were used by some makers on the so called "Flint Hawken"fullstock rifles.I haven't made one for quite a few years and it seems to be a durable mechanism and is really one I made for a pistol but the very limited area in this plate was useable.
Good luck in your build with this lock.
Bob Roller