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View Full Version : Diagnosing early unlocking in an M&P 9mm



mizer67
10-20-2011, 07:06 PM
Can anyone help me diagnose the symptoms of early unlocking in an M&P 9mm?

I was in a training class this week and was having major issues with my POI hitting 6"-7" high and 2" right at 25 yards during the drills. It was especially noticeable from rollover prone, but was consistent off hand as well. For instance, my POA was the chest and I was hitting in the neck / collarbone region.

The instructor offered to check zero for me, and he was grouping high and right as well from prone, with vertical stringing like mine. His groups were ~5" strung vertically with little to no horizontal dispersion, as were mine.

Kyle Reese
10-20-2011, 08:03 PM
I had the exact same problem from two full size M&P 9's. Solution? I sold them.

JDM
10-20-2011, 08:14 PM
Shoot some +p defensive ammo out of it for groups. It should print well. If it does, then whenever you're shooting at distance use that ammo.

I have the same issue. I sent the gun back, got a new barrel installed and nothing changed.

Good luck.