Brownells Double-Up Brush, Bronze, 37/40Mm, 12 Pack

The Brownells Double-Up Brush in bronze, 37/40mm, 12-pack is a specialized gun cleaning brush system designed for shooters who need effective, no-nonsense bore and chamber maintenance. This isn't your standard single-purpose brush — it's a modular cleaning tool that combines a super-absorbent cotton mop with tough bronze bristles, letting you tackle stubborn fouling and carbon buildup in rifles and specialty firearms in one efficient pass.

Built around quick-change aluminum couplers (both male and female), the Double-Up system lets you mix and match components in any order you want. Swap the mop and brush around, stack them together for heavier-duty cleaning, or run them individually — you're not locked into one configuration. That flexibility makes this 12-pack a genuine value for hunters and shooters who run multiple calibers or firearms types and don't want to buy a new brush for every cleaning session.

At 37/40mm, these brushes fit the bore diameter that matches those specs. The combination of cotton absorption and bronze bristle scrubbing handles the build-up you get from regular shooting without requiring a separate mop step or multiple tools. Bronze construction is tough enough to do real work but won't damage barrel steel if you're careful. For shooters who appreciate modular gear and efficient cleaning routines, a 12-pack gives you enough sets to keep one in your range bag, one at the reloading bench, and spares on hand.

Key Features

• Modular double-component system: super-absorbent cotton mop pairs with bronze brushes
• Aluminum male and female couplers allow attachment in any order for custom cleaning configurations
• 37/40mm bore diameter compatibility
• 12-pack quantity — enough for multiple firearms or to keep extras on rotation
• Bronze bristles for effective fouling removal without barrel damage

Specifications

Frequently Asked Questions

What firearms does the 37/40mm brush fit?

The 37/40mm size is designed for bores in that diameter range. Check your rifle's bore specs or manual to confirm compatibility before ordering.

Can I use the mop and brush separately or do they have to be paired?

No — the modular aluminum couplers (male and female) let you attach them to each other in any order or use them individually. You can stack both together for aggressive cleaning or run just the mop or just the brush depending on your needs.

What's included in the 12-pack?

The 12-pack contains 12 complete double-component sets, each with a super-absorbent cotton mop and bronze brush, all featuring aluminum couplers for quick-change assembly.

Is bronze safe to use on my barrel?

Yes. Bronze is a softer metal than steel and is a standard, safe choice for bore brushes. Always use proper technique and adequate solvent to minimize friction and wear.