the saga continues... compared the radially delayed upper against the blow back 9 PCC Wednesday... shows a lot of promise (with an H2 buffer it double taps in the A zone at 25yd)... ran a 3/8 drill through a Miculek comp and stuck it on the test gun and shot it today... will transfer the barrel/bolt to my game chassis tomorrow, and probably stop at the range to play with the complete package... hydraulic buffer, comp, and radially delayed bolt... I do have to clearance the rear of the ETS and Glock magazines to allow the bolt carrier to pass through