I would think any cast was built into the action or lock plates.. that surely was the stockers job, from behind the lock plates down through the wrist/
I Wonder if big name , repeat Lock buyers had templates at the lock makers, so if Henry Atkin ordered a pair of 12 bore bar action locxks, Stanton new exactly what was needed & they would be on the same page & get the same locks (or damn close) each time?...there seems alot of things that must have been sorted out for things to fit without major work...but they sure knew ho to do it...just one example of the incredible work that went into a fine old Gun before the age of computers n such
Best wishes to you all
franc
