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  • Community Default Avatar
    by - Lifetime Points: 75061
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  • L D, The AR-556 has a gas-impingement system, just like the original AR-15 rifle design and the Ruger’s SR series – use a gas piston and op-rod to unlock the bolt after firing. The SR is also much lighter making for quicker handling. Review details of the differences here : thetruthaboutguns.com/gun-review-ruger-ar-556/

  • Community Default Avatar
    by - Lifetime Points: 2998
  • The SR-556 uses a gas piston system while the AR-556 uses the more traditional direct impingement gas system of most AR-15 pattern guns.

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