What a perfect and comprehensive interpretation of the subject, Alexander. The drawing shows a lot of knowledge and speaks for itself. Thank you for having posted it. I have already emailed you the original high resolution pictures. The part of the barrel mouth is not so much complated as i told the X-ray operators to focus more on the breech section. 
Once more thank you so much for the lecture.
		 
		
		
		
		
		
		
		
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