Bartok, you are correct... I think (with all of the input) SAI has a winning product here and it's time to stop tinkering and get these moving.
Going to a DI also negates the cleanliness of the action.
JR
Fair enough. Though a Stoner pseudo piston system venting the gas out vent holes in the side of the BCG out the ejection port when the bolt is forward shouldn't be any dirtier then an AR-15.