I’ve only ever seen one, they’re hard to find and usually priced in Expert/Elite prices. Per usual, 40>45>9>357 on commonality.
Not sure I agree with the "Elite" comment since Experts usually go for around $1200 and so do 9mm SS USPs, but Elites in 9mm go for north of $2K recently - not 9mm USP SS territory.
I found a KG coded one just like the one
@Byedan has in his picture above. Got it NIB on GB in 2015 for $1092. At the time I thought I overpaid, but I'm glad to have it and would jump at another 9mm SS USP at that price now.
As for the one on GB now (
https://www.gunbroker.com/item/811576925 ) (it's not me!): He's asking 2200, but that light goes for $600 on Amazon and $618 on OpticsPlanet. Figure it's slightly used so you could sell it for $500. Then discount the gun by $40 per each 18 round mag, and $90 for the magwell and the price of the gun drops to $2200-$500-(3X$40)-$90=$1490. Try and drop the price with his "make an offer" option to $2,000. That saves you another $200 on the gun and you are at $1290 for the gun. That's USP Expert territory and more reasonable than outrageous. In fact, you better act quickly before I decide to spend $1290 for a SS 9mm with less than 500 rounds. IMPORTANT NOTE: Before you spend anything here, I would ask about condition of the rails. Based on my experience with buying (and then having to sell) too many USPs, many that mounted lights had rail damage. It's purely cosmetic, but when I'm buying a $1300 gun, cosmetics matter to me. Some rail damage is more significant than others - depending on the degree of ineptitude (or lack of experience) of the owner. For this gun, I might even ask for some pics since he hides the rails in nearly all his pics.