If you want increased barrel life, have the barrel cryo-treated, and the bore lapped. That's the best way. Depending on moly, or any other chemical to preserve a fine barrel is risky at best.
The Parsec Group are known BS'ers in the weapons lubricant business. Their attempts to slam the use of dry moly are always accompanied by a recommendation to use another type of lubricant. One that they happen to manufacture called Molyfusion.
