I've actually looked into this on my own S12 a few months back. Some of the resistance you are talking about is comming from the carrier bottom sliding over and contacting the hammer when it is cycled. You can do some profiling/lubrication on those areas to clean that up a bit but don't go crazy on the carrier especially if it's unconverted and you plan to convert it. As far as the extractor goes, I have verified the resistance you are talking about on my own gun and I found the problem to be the extractor spring itself. The factory spring is really stiff so when the extractor hits the ramp an