I REALLY wanted these and for them to work. I'm 92 fan and wanted the same safeties on my new to me Full Size, PX4 .40 S&W. Tried for hours to get them installed, but to no avail. The little arm part the extends from one of the safety levers, the side with circular spring is the wrong dimension for my pistol. That little protruding wing or whatever it is would not allow me to push the roll pins in correctly. Had other issues, but that was the biggest. I uninstalled factory safety, tried to install this version over and over, reinstalled factory safeties, uninstalled them again, tried to install these new safeties and still no go. Gave up after a couple hours and put the old ones back on. Not happy w/the old ones, the hurt my thumb and index finger when racking slide with sharp pointy edges. Oh well, still enjoy the PX4. Hopefully, I can get my money back and buy other accessories.
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