You can have Bruce Gray (of Grayguns, Inc.) convert it. If you remove the firing pin block and convert it to SAO, it can have a pretty damn good trigger, with short SAO reset. It'll cost ya though. . . he ain't cheap.
Personally though, I'd suggest an SAO Les Baer Premier II instead. It would be money better spent (IMHO). A converted USP will be hard to sell if you ever decide to, while a Premier II will always be worth at least what you paid. Plus, even with Bruce's magic done to it, a USP will never have the trigger of the P-II.
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