Sometime around the late 80's early 90's Sig started installing a heavier 20lb recoil spring in the P220. It was painted with some green paint and they rated for +P ammo. Earlier models had a 15lb recoil spring and they where not rated for +P ammo.
Four years ago, when I picked up my 220, I was doing the first cleaning, and I was upset, because I thought it was a new 220.. but what was all this green gunk all over the spring!!! I thought someone had unloaded a used sig on me, or improperly stored, that the spring had corroded. I meticulously cleaned it all off then....
When you shot this ammo, make sure you lube your slide rails with grease and float a heavy oil over it.This will make sure your slide doesnt dig into the frame rails and increase wear.
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