Hi Ken 
 
Interesting gun.  This is a tough one to I.D.  Hmmm. 
 
It appears to have been assembled utilizing a surplus musket barrel and lock in the most economical manner possible.  It's obvious the lock was originally flintlock and converted to percussion using a simple drum and nipple method. 
But I think the lock was already in conversion state before this gun was assembled.  Possible the barrel also.  It does appear to be a good example of an amateur gunsmith's work. 
Some additional photos would be good after you receive it.  Thanks for posting. 
 
Rick
		 
		
		
		
		
		
		
		
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