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Has anybody tried Tungsten Disulfide (WS2) Dry Lubricant Spray?
http://www.lowerfriction.com/pdf/8.pdf
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I use WS2 as a friction modifier in all of my lube. I coat the inside of my uppers and lowers in ws2 and then add it to my oil and grease. It is really difficult to get off once the micron powder soaks into the cerakote, parkerizing, melonite, ionbond, , and anodizing. However it won't wash off of anything without like some brake cleaner or rubbing alcohol, even on your hands. It is black and messy, but it is the most lubricious material on the planet so it makes everything much more slick. Think of Teflon or graphite, but much better at engraving in the pores of metal and non toxic. It doesn't really soak into stainless metals though.
I recommend trying it by adding to your grease and I promise you will not be disappointed with the performance.