The Dewey Brass Muzzle Guide .40/10 mm (.400-.401) is a muzzle guide from Dewey (listed under part number C40), built to keep a cleaning rod centered on .40/10 mm (.400-.401) instead of dragging against the crown. Muzzle-loaded cleaning is common on rifles and handguns where breech access isn’t practical, but it puts the crown directly in the rod’s path unless something centers it. This guide does exactly that, protecting the single most accuracy-sensitive part of the barrel from repeated rod contact. Brass construction means it won’t mar the steel even after years of regular use. Round out the setup with a rod and brush sized to the same .40/10 mm (.400-.401) from our gun cleaning supplies lineup.

Key Specifications

• Bore diameter is sized for .40/10 mm (.400-.401), so the fit is snug against the rifling instead of the sloppy pass-through of an oversized brush or rod.
• Brass construction is soft enough to ride against the crown or muzzle without marring the steel.

Frequently Asked Questions

What caliber is the Dewey Brass Muzzle Guide .40/10 mm (.400-.401) sized for? It’s built for .40/10 mm (.400-.401), so choose the listing that matches your firearm’s actual bore diameter rather than a close approximation.

Do I actually need a rod guide? If you clean from the muzzle, yes; it keeps the rod off the crown, which is the most accuracy-critical part of the barrel.

Buy the Dewey Brass Muzzle Guide .40/10 mm (.400-.401)

Order the Dewey Brass Muzzle Guide .40/10 mm (.400-.401) 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.