Hoppe's Black: Go ahead, bring the heat. Hoppe's Black Step-by-Step Cleaning System High-performance firearms deserve high-performance protection, and Hoppe’s Black delivers. Hoppe’s Black uses a formula designed for MSR’s and other high-round count firearms, but will work with any firearm. It is designed to withstand a wide range of temps from -65°F to 540°F. Hoppe’s Black is comprised of a Gun Cleaner, Precision Oil, Copper Cleaner, Grease Syringe, and Lubricating Cloth..