WHY DO THE HAMMERS SIT TO THE LEFT IN THE 92 AND PX4'S?

The hammers all sit to the left on the 92’s and the PX4’s because there is a relief cut on the right side of the hammer. It’s there, so the hammer only rides in the slide in the same spot and wears evenly. It’s more visible on a PX4 than the 92.

If you look at the slide and you pull the slide back. The width of the hammer is centered on the pusher on the bottom of the slide.