It was cold and time was limited so I simply loaded the Noveske GI-style magazine that came with it with 30 rounds of Federal 55gr ball (M193), aimed it at the center of that large flat rock out at 150 yards on our range and pressed the trigger.
Continued to do that until the magazine was empty, and got hits every time. I don't know how it shoots for group, but if someone had been out there who had just needed shootin' they would have been hurtin' fer certain.
A guy who was on the range with his 24 inch Bushmaster .223 AR varmint gun shot a couple of rounds through the Noveske and he commented that it seemed to kick less than his own 16 inch carbine. I hadn't told him about the mid-length gas system before he fired it, so his impression coupled with my own seem to indicate that the longer gas tube does help reduce recoil - or maybe it was just shooting such an obviously well-made carbine!
Looking forward to getting it on the bench and shooting for group in the next couple of days. As of now, I'm very happy with it.