I'm looking at buying a Sig, stainless steel for corrosion resistance, P299 for its size (CCW). Do ALL P229's by definition have a stainless steel slide? The black ones aren't carbon steel, they just have that Sig black finish (forget what it's called right now)? I had a P220 many moons ago and it rusted suprisingly easily. I read that the P299 always had a stainless slide to handle the heavier recoil of the .40 and .357Sig that the stamped (I think) slide of other Sigs of that compact size couldn't handle. True?