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			Most basic .22 rifles have their barrels pressed in and secured with a pin or set screw.  Once the pin is removed, the barrel is clamped in a padded vise and the receiver carefully tapped backward and off.  Age and rust can make this difficult. 
I know nothing about Cooeys - a new barrel in .17HM2 would likely need it's chamber end machined to fit the receiver. Easy enough for a good gunsmith or talented hobbiest with a lathe.
		 
		
		
		
		
		
		
		
		
	
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