"Real quality" isn't found in poorly hardened parts. Nobody made this up, it's a well documented fact. The carriage bolt gun really has nothing on an SKB, unless you are into fondling, instead of duck hunting.

Nothing.

"Best" is a subjective thing. A 2 1/2 inch chamber between the wars 1st tier London sidelock would be a poor choice for the work outlined above.

As would the very great majority of original Parkers.
Best,
Ted