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					Originally Posted by Hotspur
					
				 
				The one in the back to lock the breech block? 
 
Cheers 
 
GC 
			
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 As i approached in post #6.
To my unexperienced eye, the hole in the back seems to be horizontal. 
I reckon i see various holes but only one 
touch hole.
Also the breech cavity doesn't seem to accomodate a classic rotating cilindrical re(chamber), but rather a squared frame for a lid.
There ought to be an explanation for such an atypical system.
.