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First thing I would do is install a PX4 D spring, which from the quick internet search I did appears to be the same as the Beretta 92 series spring. Second job would be to degease and treat with FrogLube which I have found to be great at smoothing various triggers. The D spring made a big difference in my Beretta 92fs so I would start there. I have not tried this on my PX4 but its due the FrogLube treatment next time I shoot it.