Plan on replacing the recoil spring and buffer more often, such as every 2,000 rounds or so.
Really ? I'm surprised to see you say that.
I have a total of about 11,000 rounds through one of my USP .45 compacts, 2000 of which were Federal Hydra Shok 185 +P, 200 of which are Pro Load 200 +P, and 120 rounds of Pro Load 230 +P.
Half of the remainder are 230 grain Federal American Eagle, with lots of S&B and hot Euro Fiocchi along with some Speer Lawman and CCI Blazer (medium hot) in the mix.
My recoil buffer looks fine, just a tiny bit of "skirting" and no obvious wear. The pistol functions 100% reliably. Did a detail strip last night and there's no obvious wear on any surfaces in the hammer and trigger subassembly components when compared to a detail strip of my newer USPc with less than 1000 rounds through it.
Frame looks exactly the same as after the first 3000 rounds, but the frame feels a little smoother than the newer pistol (stippling and diamond checkering has probably worn down a little bit).
Barrel and locking lugs look new, top surface of the locking block has slight wear, as do the nose corners of the slide from holstering.
Also, HK Sterling told me to expect at least 10,000 more rounds before replacement of the bufer and/or recoil assembly given the present condition of the pistol. Given what I have seen of rental range USP's, I have no reason not to believe that- yet.