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A really weak answer but I have a KSC Mk23 with suppressor, and I assume any outer barrel with threads you buy will have the right sized threaded muzzle. The standard is 16mm clockwise thread for those things. Can't help much with the outer barrel and where to buy, but I think it's safe to assume the USP and Mk23 are the same for airsoft (as they are for real steel, except a different recoil enhancer in the supressor for each........... not that it has anything to do with airsoft though).
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