Grey Coating in inside of AR Upper Rec?

[Gringo Bandito]

Does anyone know which manufactures use this dry film lube coating on their AR's? I have been told that there is 4 Manufactures that do it but I do not know which ones they are.

Thanks for the help.

[6172crew]

My LMT has the same coating but out of the 6 upper sent to my FFL back then not all had the gray dry-lube sprayed inside.

[-hanko]

Does anyone know which manufactures use this dry film lube coating on their AR's? I have been told that there is 4 Manufactures that do it but I do not know which ones they are.

http://www.armalite.com/library/techNotes/tnote43.htm refers to magazines, coating same in areas likely to wear in the gun.

No idea as to number of suppliers. If the stuff is mil-spec and the spec has a qualified producers list (QPL), you can probably find suppliers on the web. I'd spend some time on arfcom also...biy forum might be a start.

-hanko

[Gringo Bandito]

Thanks Fellas.

[dw1784]

GSE is another that use dry film coating.