In the early days of the R9, the company recommended using a gun grease, which we all did.
I believe it was later discovered that the user would apply way to much grease on the slide and other parts.Then Rohrbaugh decided that the use of a good gun lube will give the same result.
In shooting many rounds at the range, here is what is discussed on the Seecamp forum, I think this will help for those that shoot, and enjoy shooting the R9 a lot.
Use the same recoil spring at the range each and every time you go to the range.
Change it to a new non fired spring when you get home from the range and clean the R9.That one new unfired will last a long time.That will be your carry spring, the other will be the range spring.