First of all welcome to the forum. My Sig 1911-R came with a sample tube tw-25 with it. It's a synthetic grease probably a fluoropolymer. It,being a fluoropolymer grease, is impervious to heat, and imbeds itself into the pores of the metal suface that it is applied to, and will keep lubricating long after the visual sight of the grease has vanished. There's a few companies out there that service the gun industry that are a whole lot cheaper than Mil-com.