The PPQ SC LE version uses metal sights and the rear sight has to be adjusted with the sight pusher. There is no screw on the LE version's rear sights. There are two different versions of the PPQ SC. The regular or original and the Law Enforcement (LE) version. I had the latter.Okay, lets see if this clears things up.
The PPQ fullsize, P99, P99C use a spring and plunger system, where the spring and plunger are embedded in the bottom right side of the dovetail. The sight
Having said all that, keep in mind the dovetail dimensions are the same between all these pistols. Therefore the PPS type sights, which are 'drift adjustable'.....meaning you've got to use a sight pusher or hammer and drift to install will fit any of these pistols, including the PPQ SC.