ksc and kwa are in no way affiliated with kjw. the slide won't fit. you'll have to get one that's for the kjw usp specifically. check airsplat or airsoftatlanta for one of those.
What's a signature?
The KSC slide is most likely for the compact since they don't make a full size USP
Meet every day like a swift kick to the groin
jungletoy has it for 59.99 its out of stock though
I hate those Spec Ops USPs with the threaded barrels. Why can't anyone just make a quality USP? Hell if KSC would just add some length to the barrel of theirs that would be it!