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L D H. asked 6 years ago:
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.
Trevor D.
6 years ago
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 : https://www.thetruthaboutguns.com/gun-review-ruger-ar-556/
James G.
6 years ago
