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					Originally Posted by eftihis
					
				 
				Here is a 17th century (approx 1670) ottoman long wall gun (1,80cm length).This type of bulbous barell was first used in matchlocks, and this barel must be re-used from 16th century. Question is why these barels have this bulbous end? And how this gun was used? There is a strange surface on the down side as if it was attached to something else and may be used as a swivell gun. 
			
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 Again, you have only beautifull things!
A lot has been said by Oliver and I'm sure Rick will answer to your other questions. I think the lock is old too. For me it's a quite homogeneous gun from the end of 17th c. as you said, including the barrel.
Best wishes