Interesting observation MRC. I took mine to the range the other day with O-rings and tight grip screws on the left VZ grips, but no O-rings on the right to check out function without the O rings in terms of trigger reset (discussed on another thread). After about 6 mags, returned home and found BOTH sides had loose grip screws. (I had one or two trigger reset problems that I think were due to my trigger control, but those occured early in the session and did not recur). I wonder if slight variability in the screw holes during production is possible, since my R9 frame is practically new, with perhaps 200 rounds through it before this range trip.