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Second time out shooting my new Smith & Wesson M&P .40
I did a previous post on the slide stop not staying down w/o constant pressure.
Now, the gun is averaging 3-4 Keyholes per 10-12 shots. Looks like vertical hour glasses. Winchester 9mm ammo.
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Is it .40 or 9mm? I've read that the lock up on some of the 9's releases early and causes accuracy issues.