Originally Posted by USVI
Here's a quote from that "other" forum."HK GmbH tests during the development of the USP45 indicated no reason to replace recoil springs for 18000 rounds, ammo and shooting schedule dependent. Other HK pistols like the USP40 C-LEM, P2000, etc easily pass 10,000 round Govt tests with all the original parts."
If you can afford(or find)that many rounds.
I find HK Parts to be a great company to deal with. When looking for other accessories I like Optics Planet. http://www.opticsplanet.com/
Both of these sites have fast service and reasonable shipping costs.
I have burned a heap more than that and the springs are still good to go, +P+ seems to cycle the best, almost like the gun was specifically designed for the stuff
Stock 950 fps simply cycles the gun but a +P+ the gun responds crisply.