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Old 03-07-2010, 11:35 PM
Medic650 Medic650 is offline
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Join Date: Jul 2008
Location: Ellis, Ks
Posts: 50
I looked at a retrofit piston system a gunshow today that a dealer had on his personal gun. I don't know if it will work on a whisper but I may get a pistol system to try on my upper. Alan from Machine Gun Tours swore by it.
Adams Arms piston system. 3 position gas block, standard, suppressed, and off. http://adamsarms.net
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