Dan, I think George Hill IS/WAS Kodiac.
GH/K: Loaded rounds popping out is almost always a too-wide feed lip problem, IME. Do a quick visual check on your mag's feed lips. If they're say, 1 mm or so wider than the other mags', just bite the thing into submission.
The plastic covering over the metal makes that an almost pain-free activity.
What's the max downrange distance at this great shooting range, anyway?