Do all/most of these guns "share" the same action? Are the basic actions made by a cooperative or a separate company? Is it a forging, investment casting, or just machined from a steel billet? When I compare these high grade Spanish sidelocks, it appears that all the screws and pins are in exactly the same place....

Do these makers buy the basic barrels from a common source, and then finish them in their own factory?

JERRY