https://www.facebook.com/photo/?fbi...831499737&comment_id=927896600263728

A facebook post by Paulo Santos shows a Purdey with what seems to be a hand detachable lock. The lever is replacing the fron retaining pin on the PUrdey lock. From what I can see any attempt to turn the lever would make it bump into the fence.

Anyone know anything about hand detachable Purdey locks?