The use of graphite is limited by its tendency to facilitate pitting corrosion in some stainless steels, and to promote galvanic corrosion between dissimilar metals (due to its electrical conductivity). It is also corrosive to aluminium in presence of moisture. For this reason, the US Air Force banned its use as a lubricant in aluminium aircraft [4], and discouraged its use in aluminium-containing automatic weapons [5]. Even graphite pencil marks on aluminium parts may facilitate corrosion
Graphite is also abrasive. It is okay for things like the Pinewood Derby axles, but for guns, no.
Haha...that's the only thing I can EVER remember using graphite as a lube on, back in Cub Scouts. Funny you should mention it.
benEzra said:Posts: 3,692 NEVER, EVER, EVER, EVER use graphite on an AR, or any other gun with an aluminum receiver or other parts.
Graphite eats aluminum, via corrosion, if the humidity is high or it gets moisture in there.
I think it's a poor lube for guns. It's sort of an old-school, low tech dry lube. I remember it mostly as a lock and hinge lube in which the graphite particles are suspended in a petroleum vehicle that evaporates and leaves a dry film of graphite. Apparently it's lube properties depend on the fact a water film forms between the plate-like particles of graphite.