Just FYI, make sure you know what KSC system your USP is. A System 7 USP can only use System 7 slide, the old one wouldn't work, and vise versa. Now within the system, any USP .45 slide should be interchangeable, and any USP Compact slide should be interchangeable.
+1 for the VFC adapter, I've had the KA and VFC ones, and I like the VFC one better, its just a simpler system. If you want a dedicated USP light, you need to go with Insight M2 UTL, which is made for USP(for $130-ish USD on eBay), or if you can find it, Tanaka makes one for airsoft....
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