Hi all,

Just a query out of curiosity, but how do you think the raceway for the sliding bolt in a Purdey double underbite system is machined in? It would seem the top tang is obstructing access for a milling machine. Is the tang heated and bent out of the way for this operation? From the guns I've managed to view the recess mostly looks quite rough, so I assume there is a lot of filework involved.

Any ideas?