The Dewey 37mm/40mm Replacement Cleaning Mop is a replacement cleaning mop from Dewey (Dewey part no. M3740), built to hold solvent or oil against the bore rather than scrub fouling loose like a brush does. A mop’s job is different from a brush: it applies and spreads solvent or a light protective oil evenly rather than breaking up carbon and copper fouling. This one is sized to replace a worn mop on an existing rod without buying a whole new cleaning kit. Keeping a spare mop on hand means a cleaning routine never gets interrupted by a worn-out consumable part. Round out the kit with brushes and patches from our gun cleaning supplies lineup.

Key Specifications

• Made by Dewey, sized to replace a worn mop on an existing rod without buying a whole new kit.
• Built as a single-purpose accessory rather than a bundled multi-tool, so it does one job well.

Frequently Asked Questions

Is this made for a rifle or a handgun? This one is built for shotgun use specifically.

Is this compatible with other Dewey cleaning gear? Yes, it’s designed to work as part of a standard Dewey cleaning setup.

Buy the Dewey 37mm/40mm Replacement Cleaning Mop

Order the Dewey 37mm/40mm Replacement Cleaning Mop directly from Dewey’s lineup of gun cleaning supplies. It ships straight to your door with no FFL transfer required, so it’s ready to add to a cleaning kit as soon as it arrives. Our Lubbock, Texas team stocks the rest of the gear needed to round out a complete cleaning setup.