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			What is a "thread chaser." 
 
I have never really had a problem with choke tubes coming loose, but that is probably because I switch mine quite a bit so they don't really have time to get loose.
		 
		
		
		
		
		
		
			
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				The pond, waterfowl, and yellow labs...it don't get any better.
			 
		
		
		
		
		
	
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