Has anyone heard about the reliability of the Aluminum frames on 1911's. I have a Kimber tactical carry that has an Aluminum frame. I have the fullsize custom II that has the steel frame. I am going to be buying a 4" model and the Kimber CDP II pro has an aluminum frame while the Eclipse Pro has a steel frame. I would like these things to last a lifetime with proper maintenance and be something I could pass down to my future (knock on wood) sons. Thanks for any info you have.