Recoil spring is really the only thing. Sprinco springs have a 30k cycle life so they really don't need to be in the range bag. Every part that may need replacing is a handfit part so having a slide stop, bushing, extractor, on hand really isn't vital.
Mags go without saying of course.
I just looked through my range bag and agree with Joe above. I do have different recoil springs, but that is because STI gave me varying ones. I must not know what I am doing, because I do not really experience a noticeable difference in the factory ammo I have been shooting, which varies pretty wildly (I wasn't smart enough to stick to a Brand, gr, and lot for consistency).
When I was a 45 1911 guy many years ago, I had a spare extractor that I had tuned for the gun. I am not sure why, just paranoia?
One thing I just thought of, is maybe spare grip screws. I have seen some folks loose the tiny screws at the front of the trigger guard. I think those are threadlocked from factory, but if you broke that, maybe a good idea? I witness marked mine, and they spin freely in there but have not loosened yet.