I bought a new CZ P-01 Omega about a year or so ago and I'd like to get together a supply of the most commonly broken parts on the gun. I've put a few thousand rounds through it so far and I fully expect the original parts to last many thousands more, but I like to be prepared, just in case. Just to start, I'm assuming all the springs, the extractor and the guide rod would be good. That sound right? What else should I be considering?