I did use the rubber o rings that came with the grips, on my first install. I took the panels off and re-installed them, making sure they weren' "farmer tight". The mag seems to drop freely now...but will have to hit the range to make sure the issue is resolved. I did send LOK an email regarding my problem, and they responded right away with an offer to send another set of panels and a shipping envelop for the return of my current set. I let them know I appreciated their quick response and offer, but hopfully had resolved the probelm.