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Old January 28, 2013, 11:07 PM   #4
HKFan9
Senior Member
 
Join Date: May 3, 2008
Posts: 2,715
What make is the rifle.. or the upper for that matter. Some companys don't follow the mil-spec standard.

Smith and Wesson does it the opposite way. Others I am unsure of off the top of my head.
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