I use a light grease on the rails on my 1911's in .45 acp ( Wilson Ultima lube ).....but on my 1911's in 9mm, I use oil .....( Wilson Ultima, or Break Free)....
but you're right / there is no real consensus.....even among several of my buddies that shoot 1911's...( grease or no grease, some use Break Free on everything, some use Rig Oil, some Rem oil, some Wilson's ultima lubes, some Gun Butter, one uses Frog Lube....??? ).....
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