KSC USP .45 sight compatible with rs optics

[systema]

Are real steel USP .45 sights compatible with a old style KSC USP .45 CNC metal slide?

If you need anymore info about the gun before answering, just ask.

Thanks

[racingmaniac]

The front should work, the rear is a bit more problematic. Not sure how different the sight is though between old version at the new since I've tried it on the new version and it was not an easy fit for the rear sight...

[Mles]

KSC slides are cnc?