One of my early 1911's, a Colt Mk IV Series 70, went somewhere in the area of 80,000 rounds before I sold it. I replaced the recoil spring and FP spring every 6,000 rds, replaced one disconnector, broke one mag release spring and replaced one mainspring housing pin that sheared in half but wasn't noticed until i removed the MSH for routine maintenance. I also had to restake the plunger tube twice due to looseness (not failure).
In spite of some of it's detractors the 1911 is pretty durable, especially if you are willing to be you own gunsmith (pretty much mandatory)...
Blake