TSI-301 is a high performance synthetic lubricant. Its best for us is cleaning the bore and barrel. TSI-301 is an advanced lubricant designed to deeply penetrate the surface of metal by seeping into its microscopic pores. Its high efficiency means only a small amount is needed to deliver exceptional lubrication. Even when the metal feels dry to the touch, TSI-301 remains at work below the surface. It forms a thin, active layer that helps lift away rust and debris. This layer bonds to the metal through physical adsorption, lowering surface tension, reducing friction, and minimizing wear. Best of all, it won’t leave behind sticky or gummy buildup over time.