I rather doubt any of the gun makers produced their own locks. At times I have suspected otherwise but it just doesn't make sense. The lock making trade was so highly specialized and there were a number of companies producing for the trade. However, I could never figure out how a lockmaker in Wolverhampton could fill and order for a shop in another town and have the hammers (strikers) fit perfectly, etc. there were just too many variations and each gun was basically a "one off piece". Well, I think I've found a hint that seems logical. James Dougall, in his 1865 book, "Shooting Simplified", indicates locks were supplied without hammers (strikers) and the lockplates were probably larger than finished blanks. The gunmaker would then file the plate to the desired shape and also workers would make the hammers (strikers). Here is an excerpt from his book that contains the hint:
