re: Taurus PT-111 Millenium Pro 9mm misfiring

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try running some 124 or 147 grain ammo. Those should run better.

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If I'm not mistaken, the PT111 is a clone of the Kel-Tec P11 which makes it a striker-fired action. If that's the case, the firing pin has a retaining screw or allen fastener on top of the slide that holds the firing pin in place. Unlike a hammer-striker which uses mass to fire, the striker-fired mechanism utilizes speed and momentum. Any drag on that lightweight firing pin and you have light strikes! The firing pin retaining screw must be snugged up against the firing pin, then backed off at least 1/4 turn to free up the pin. Perhaps something was gunking up the firing pin channel, another possible problem. It's too bad your gun dealer couldn't have checked that out because the fix is really-really easy, if that is indeed the problem and I'll bet it is. Sure, you're getting proper indentation on your primers but if there is the least bit of a drag on that firing pin, it could be slowing down to the point of denting but not igniting. I carefully chamfered the firing pin channel on my P11 to keep it cleaner.

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