Birchwood Casey Synthetic Gun Oil - 10 Ounces - Reduces the friction between mating surfaces. Will not gum up or lose its viscosity under extreme temperature variations from -55-degrees to 300-degrees. The natural solvency of synthetic gun oil cleans as it oils while its low evaporation rate assures protection against rust. Excellent For Lubricating And Protecting All Firearm Metal Surfaces Suitable For All Climates