12 Best Add-ons and Accessories for the AR-15

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Piston drive system

Cooler and Cleaner? This may be for you!

http://dailycaller.com/2014/06/25/6-facts-about-ar-15-gas-impingement-vs-piston/

Image Source: http://modernfirearms.net/civil/usa/ar-15-e.html
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