LA Survivor, give them a call. They openly admit they suck at checking their e-mail. They are very very helpful on the phone.
The Adjuster is supposed to fit the USP:
Quote:
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A3BSR Fits Glock 17/ 19/ 20/ 21/ 22/ 23, H&K USP, Sig 220/ 226, S&W "most full size 9mm & .40's", Ruger "P" models*. $109.95
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It doesn't say HK USP Compact, but they're roughly the same size as a Grock 19. Safariland makes the same holster.