1911s are just like a Harley - got to be dripping in oil (or just dripping oil)
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Ok, seriously, so I use Mobile One synthetic red grease on sliding parts (no molybdenum), pistol locking lugs, and barrel bushings and Mobile One 10-30w synthetic for moving parts. Wipe on, wipe off grasshopper. Hell, I use 90w Mobile on my MEC (MEC's seriously akin to a Harley anyway)!
I've kept Kellube M12 around for years. LOVE the thin tube applicator and the product. I buy a bunch of bottles and hand 'em out to buddies.
Anyone see Lucas extreme gun oil on a shelf? What do you think their major business is? OIL and gas cracking!
If you're around WYO you'll probably run across Lucas oil sites.
Next time you empty a plunger tube of your favorite grease, take your grease gun and fill it up w/ Mobile One red. My Guerini shotguns love the stuff. Little dab will do ya.
I think you need the pressure protection found in the grease and the shear protection found in the oil. Not that gun oils don't have of that. I've used everything under the sun, and none of it has failed.
But, if it's good enough for your wheel bearings, it'll work in your firearms.