I have noticed that my groups have moved to the left a bit over the 12 and 9 years I've been shooting my G19 and G21 respectively. The groups remain good and continue to surprise my shooting buddies who are not that familiar with Glocks. Other than the probably 10,000 rounds (possibly more) through both of them, no factors have been changed other than new recoil springs and striker springs (factory spec.). The guns remain in excellent condition and continue to function perfectly as always. Has anyone else noticed a drift in point of impact after lots of rounds? I use the same shooting range, ammo (reloads and factory) and paper targets and my vision remains good, so I suspect normal wear has caused a slight shift. I ordered the MGW sight adjustment tool and will be making a slight adjustment to the rear sights of both pistols to bring them back to center. Just wondered if anyone else experienced something like this. Thank you for your thoughts on this.