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Is this using the commercial spec-size receiver extension tubes or mil-spec size?
2 Answers
Ruger AR-556 16.1" 223 Remington/5.56 NATO AR15 Semi Auto Rifle
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James this definitely uses a Mil-Spec Diameter Buffer Tube. (Specifications and Features): - Ruger AR-556 8500 - AR-15 Semi Automatic Rifle - 5.56 NATO accepts .223 Remington - 30 Rounds - 16.1" Cold Hammer Forged Barrel - 1:8" Twist - Muzzle Threaded 1/2-28 TPI - Carbine Length Gas System - Mil-Spec Diameter Buffer Tube - Six Position Collapsible Stock - Overall length 35.5" - Weight 6.5 lbs - Black.