This is a Hoppe's Liquid known as the Black, model HBL4A.
High-performance firearms deserve high-performance protection" and Hoppe's Black delivers. Designed for MSR's and other high-round count firearms (but safe to use with any firearm)" Hoppe's Black High-Performance Precision Oil Aerosol delivers with the touch of a button. The included extension allows for lubricating oil to be placed precisely where it's needed. Hoppe's Black is designed to withstand a wide range of temps - from -65 degreeF to 540 degreeF - and will prepare your firearm for any situation.
Features:
Will not gum up with exposure to high temperatures
Industry-best temperature range of -65° to 540°F
Includes rust inhibitors