With the newer shadow 2 TRS I wouldnt worry about replacing them that often. I see around 25k round out of them in my practice guns that get a lot of dry fire. Do it yearly in your match gun or every 15-20k rounds if you only have one gun. With the slide stop if you have 1 gun have a match and practice slide stop. If you have 2 guns run the practice one until it breaks and put the old match one in the practice gun and a new one in the match gun.
This line on the list should cover the OR
"Orange", "Black" and other variants of the CZ 75, Shadow, Shadow 2, and SP-01 are approved, provided they meet other Production criteria for action type.
Keep a spare extractor, TRS and slide stop on hand. Odds are good you wont need to replace anything for 25-50k rounds.
Spare optics are a good idea they dont seem to last as long
The newer purple/redish shadow 2 springs are far more durable than the older ones. I have only broken them in my dryfire/practice guns and even then typically see 30k or more rounds out of them.
Pretty sure they are the same part number and just a change in design from the factory. Half of shadows came with one style the other half with the newer one. I still have a couple of the old ones in my bag I think. Remind me at the next match you see me at Rowdy and I will give you one.
I clean my main practice gun every few months normally between 5-10k rounds. I add oil each time I shoot and and only clean it because it gets sluggish or I break something (TRS, Slide stop, ETC). Match gun I will clean every couple of majors so it gets cleaned around every 1k rounds. only change from this is I will clean any gun if I have to shoot in a rain storm.
The shadow 2 will run for a long time dirty.
I never push anything other than bullets down my barrels.