Mercury - Quicksilver Pistol Grip Grease Gun Marine Maintenance Tool For 8 oz Grease Tubes 37299Q2. Overview. Keep your boat's moving parts running smooth with the Mercury Marine 37299Q2 Quicksilver Pistol Grip Grease Gun. Compact and easy to use, this grease gun is designed for 8-ounce Quicksilver grease tubes, including 2-4-C and Extreme Grease. The pistol-style handle provides clean, one-handed operation, while the flexible feed hose makes it simple to reach tight, awkward grease fittings. Wh