Hello Marc.
Have read your above message stating won't sell parts separately. Have been trawling the net looking for a breech block and other parts for mine.
Have a 6 pounder in Warkworth NZ and it has had the breach block cut. See you have one in your spares. Can't help but try.
Can send you photos to prove I have one if you like. If the parts don't sell with the gun I would like to get mine operational again.
Happy to supply email.
Thanks Stephen.