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Old August 15, 2012, 04:51 PM   #2
Senior Member
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 4,483
it's a adjustable choke for the tip of your barrel
Au is not a "choke", it is a barrel weight adjustment system that supposedly lets a shooter "adjust" the vibrations in the barrel when it is fired to get better accuracy.
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