When my new R9s arrived, I disassembled it (easy), applied a few dabs of oil, and reassembled it (PITA; but now I've climbed the learning curve). FWIW, German-made Knipex self-locking slip-lock pliers do a better job than Channel-Locks of gripping the recoil spring assembly.
I brought four different kinds of 9mm ammo with me to the range:
Winchester WWB
Fiocchi 115 JHP
Blazer Brass 115
Federal Hydra-Shok 147
I fired 14 rounds of each -- 7 from each of the two magazines that came with the R9s.
I'm delighted to report NO FTFs or FTE, no stovepipes, and no keyholes in the targets. I was equally pleased that recoil was "snappy" rather than painful. The R9s is actually more controllable than my Seecamp LWS32, but you guys probably knew that!
The Fiocchi's definitely felt hotter than the other cartridges. Surprisingly, the most comfortable to shoot were the Federals.
I've ordered some "premium" 124 grain rounds, but for now, the big Hydra-Shoks are my favorites. (I buy into the notion that heavier bullets lose less velocity when fired from a short barrel -- although I know that many people hate 147s in 9mm.)
Incidentally, where can I find the list of "Rohrbaugh-recommended" rounds? Has anyone put together an authoritative shortlist? If so, what's the link.
Incidentally, incidentally -- I joined the forum the other day (in anticipation of receiving the R9s). I've enjoyed reading the forum posts. To complete the introduction, I live in North Carolina.
Ron