It is a piston gun. No gas tube.
And your point is???.....
Operating system type has nothing to do with whether or not the gun is designed to take a standard ar-15 barrel. Last time I checked a piston system or gas tube wasn't part of the barrel.
Anyways, RWA has answered all I needed to know;
Our upper takes standard rifle length AR15 barrels. You can change out a barrel in approximately 10 minutes. Standard model is chambered to 5.56 but can be changed out to .223 Wylde or .300 blackout for example.
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