Colt has the fewest mim parts outside a full custom builder like nitehawk or les baer.
Obviously not familiar with 1911 manufacturers. Ithaca, Dan Wesson, and SVI (Infinity) production models have zero (0) MIM parts - and are not "full custom builders." You can also get models from STI with no MIM. Colt pistols have a mystique and associated with the history and horsey on the side that some people just can't seem to get past. I got past Colt 1911's about 25 years ago after owning two of them. They're okay, not the best and not the worst. They make a fine base gun for having a full custom built, but outside of the Elite Series and Special Combat Government, they don't make much that I'd consider owning.