The product we used is Cerakote MicroSlick C-110. We have had good luck with it and on semi-auto firearms is allows the gun to be used dry.

Quote
From the Cerakote site.
MicroSlick Dry Film Coating
Item: C-110

Description:C-110 MicroSlick is a ceramic dry film coating used to reduce friction on a variety of internal firearm components, such as bolts and bolt carriers.


Here is the technical paper on it. Cerakote MicroSlick

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