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Old April 18th, 2006, 17:50   #24
Greylocks
 
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Join Date: Dec 2001
Location: Gatineau, Quebec (Near Ottawa)
It's closing the bolt hold-open device (usually it's on the front of the gun) from it's open position by slapping it sideways and letting it slam forward.
Folks think it chambers the round more effectively. Gunsmiths know better.
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