I immediately swapped out this spring when I got the fork, no rides on it at all. It's the standard red u-turn spring for a 130mm recon or revelation. RS part number 11.4310.137.000. The red spring is for a rider weighing 160-180 lbs.
The spring has a few rub marks with some rust on the bottom (see pics) but not too bad. This will also fit 2.75 stroke shocks. The 300 # spring is weird because it will fit from 2.75 to 3.0, but the 350# spring won't.