Hi Mel and Corrado26 
Thanks for interest and Corrado26 you have found a v close match few differences but overall construction V similar. 
Mel  
The barrel narrows about an half an inch from the nipple to a v small diameter of maybe 4 mm or so but i am unsure if there is a chamber behind the constriction or not  
there otherwise a uniform diameter for the remainder of the barrel  
 
Thinking about the weapon it is v concealable and might have been designed to be used with or without the barrel attachment.  ie a short or long ranged weapon  
the absence of shoulder stock attachment though is awkward.  but resting on a wall or fence would negate this difficultly 
 
regards 
 
Ken
		 
		
		
		
		
		
		
		
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