Rem oil Pro3 MSR (Pro "cubed") is a premium gun care lubricant that provides lower wear, higher lubricity performance under stress and superior corrosion protection. Rem Oil Pro3 MSR 2 oz. Pro-Tects Against Corrosion - Rem Oil Pro3 Msr Protects Your Firearm From Harmful Rust And Corrosion Up To 3X-5X Longer Than The Competition.