I regularly see junk guns at antique and arms fairs, and if they are cheap enough they can be a  nice antique gun kit or a source of spares. Think how much work there is in a good barrel...sometimes worth the money for the whole gun. 
Last weekend one of these was being sold at the Birmingham arms fair, but honestly labeled as a "decorative wall hanger". 
 For a laugh though, here's the lock off one of these I bought a couple of years ago for the sake of the decent, though cut down, rifled octagonal barrel. NB the brass tumbler inside the lock, I think the cock is genuine, and perhaps the lock plate.
		 
		
		
		
			
		
		
		
		
		
		
		
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