Originally Posted By: Doverham
My understanding is that the striker discs do not enter the breech face on the perpendicular, but at a downward sloping angle. If so, that must add some serious complications to making one from scratch. How do you match the angle? And doesn't that then affect the threading?


You're correct that the striker discs enter the breechface at angles both downward and outward.
This has no effect upon the threads or anything else. The new part is made in the lathe as usual and then cut off and filed flush to the breechface after being screwed in.
Everything is concentric to the firing pin hole centerline, there are no angles to match.