Brownells Double-Up Brush, Bronze, 37/40Mm, 3 Pack

The Brownells Double-Up Brush is a modular 37/40mm brush system built for shooters who need flexibility and efficiency when cleaning specialized firearms. Unlike single-purpose brush designs, this three-pack gives you interchangeable components—bronze brushes paired with a cotton mop—that snap together in any combination you want. Whether you're maintaining a less common caliber or just prefer to assemble your cleaning tool on the fly, the Double-Up approach lets you customize your setup without buying multiple separate tools.

Each component features aluminum couplers (both male and female) that lock together securely, so swapping brushes takes seconds. The bronze bristles handle stubborn fouling and carbon buildup with confidence, while the super-absorbent cotton mop tackles solvents and final cleanup in one pass. The modular design means you can pair the mop with a brush, combine brushes, or build whatever configuration works best for your cleaning routine—no wasted tools, no compromise on capability.

This is practical kit-building at its best: three complete units give you backup components, options for different guns or cleaning stages, or spares to stash in a range bag or truck. Bronze bristles are gentler than steel on some finishes, making this a smart choice if you're running specialty ammunition or shooting less common platforms where dedicated brush selections are hard to find.

Key Features

• Modular design with aluminum couplers—mix and match components in any order
• Bronze brushes paired with super-absorbent cotton mops
• 37/40mm diameter—fits specialized firearm bores and tubes
• Three complete units per pack for redundancy and variety
• Durable aluminum construction resists corrosion and wear

Specifications

Frequently Asked Questions

Can I mix and match the brushes and mops from different units?

Yes. All components have aluminum couplers that attach to each other in any order, so you can assemble custom combinations suited to your specific cleaning needs.

What's included in the 3-pack?

You receive three complete units, each with a bronze brush, a cotton mop, and aluminum male and female couplers.

Will these brushes work on standard rifle calibers?

The Double-Up Brush is sized for 37/40mm applications. Check your firearm's bore or tube diameter to confirm compatibility before purchase.

Why choose bronze over steel or nylon?

Bronze bristles are softer than steel, making them a gentler choice for sensitive finishes while still delivering effective scrubbing power for fouling and buildup.