No, they do not Kyle. Just firing pin blocks.
The Sig 1911's do not have a key lock. The circle on the 1911 slide is not ils or a key lock, just a screw with a pin that holds the series 80 stuff in the way the colt internal extractor holds theirs in. You unscrew it and the series 80 parts fall out of the slide. They originally did it that way as they have the external extractor and the internal extractor is not there to hold it in. They have since done away with it and went to the "fake" internal extractor to hold the stuff in.
Sig does, or did have the E.L.P.S. introduced around 1999 as an option or something like that. It was never on their mass produced guns and I have never seen one.
LMAO, I originally said mass produced buns but meant guns naturally.