For some reason, I always have a real pita zeroing my Aimpoint. In this case it was due to the lining up the dot with the stock sights, when the front sight was not centered.
Regardless, with albertacoyotecaller's assistance I finally got it set up. Unfortunately, I was pushed for time and the test is quite brief.
Three shot groups were fired at circles 1, 2, and 3, at 25m. 1 was after zeroing, 2 was after removing and reinstalling, and 3 was after removing and reinstalling again. I was using a 4 MOA dot Aimpoint Comp M2. The rifle was benched with mag resting on the table. As you can see, there is some variation in where the groups hit, but they're well within acceptable for the target design, the high brightness setting on the M2, wobbly rest, and the fact I'm a lousy shot, IMO. , I'm confident in saying that the rail is top quality and well worth the money.
One item to note, the set screw that holds the ball detent for the pin loosened off and I was able to easily remove the pin with my fingers. A little Loc-tite took care of that issue. You can also replace the NEA pin with your stock hand guard pin. I also noticed a slight variation in hand guard pin hole size on my two rifles.
