I'm putting together my list of future investments and need to know a little about 1911s. I've shot a couple and love the way they operate. 1911s and Sigs fit my hand like a glove, one of these are going to be my main defensive handgun in the future. Anyway, I had some questions about certain 1911 features: -What is the advantage of Series 70 type of guns versus non-series 70? -Is there a performance difference between solid, full-length guide rods in comparison to the traditional bushing recoil system? -Internal vs. External Extractors--opinions? I've looked a lot of this up on youtube, I'm just really interested in hearing your opinions. I trust the people here on Glocktalk to give good, honest info and feedback. By the way, the guns I have been looking at are the Kimber TLE II, Springfield Range Officer, Ruger SR 1911, and S&W TFP.