the winfer Book is excellent. If you can find a copy of the literature that Len Bull put out when he was running Action Castings you will have very good dimensional drawings. I'm sure I have multiple pictures of stripped actions on another PC. I'm incredibly busy at the moment but if time allows I will forward you what I have. It is mechanically the best British falling block design in my mind, but the Gibbs is where my hear lays.
Steve

Firearms imports, consignments


[Linked Image from i.imgur.com]