Thread: Piston Upper AR
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Old November 10, 2012, 07:07 PM   #2
Sweet Shooter
Senior Member
 
Join Date: June 17, 2011
Posts: 503
PISTONS

Pistons are definitely being proving. I'm not sure how reliable the x39 is in the AR platform, but this is an eye opener with the 5.56 piston.
-SS-
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