Unscrew the stop-bolt about four turns, or remove completely.
Withdraw breech-block.
Remove extractor, which is now free.
In general nothing further need be dismounted for cleaning and inspection.
To dismount completely continue as follows:
Remove locking-screw pin with screw-driver.
Remove stop keep-screw.
Drive out stop with the drift, interposing a bit of wood or leather to avoid bruising the stop.
Withdraw handle and locking-screw shaft.
Remove locking-screw.