It's only substantiated by experience, smallfry; mine. I don't expect everyone to agree with it. When someone does disagree, I count it as a difference of opinion. Simple as that.
I started building/rebuilding 1911's under the tutelage of an old Army armorer who spent some time at AMTU. He knew his stuff and had a seemingly endless supply of USGI parts. Those parts are all but dried up now. There are plenty of 1911 parts that are as good as USGI. I haven't rebuilt one for 4-5 years so I can't comment on current production. I like Wilson parts except their extractors, Ed Brown without reservation and MGW about as well. Wilson' 'factory plus' parts are what I use when I wan good, GI grade replacements.
In closing, I don't consider or represent myself to be anything other than an armorer-level mechanic.
