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Old June 13, 2013, 09:22 AM   #12
allaroundhunter
Senior Member
 
Join Date: May 6, 2012
Location: Southeast Texas
Posts: 1,670
The easiest way to tell is by looking at the gas block.

However, when you see AR prices get closer to the $1,750, you can start asking if it is a piston gun.
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