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Posted: 6/15/2009 8:14:19 AM EST
Check out this article if you think you might be interested in a piston upgrade or a piston gun.

http://www.defensereview.com/ruger-sr-556-gas-pistonop-rod-ar-15-carbine-ruger-enters-the-piston-driven-ar-fray/

Just for your information
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