Description
The Sinclair International Nylon Rifle Bore Brush covers .375 caliber rifle bores and shows up twelve to a pack, so you can toss a fresh one on the rod every time you clean instead of nursing a worn-out brush through another season. What sets Sinclair's nylon brushes apart is that they're built with stiff, heavy bristles and made a touch larger than bore diameter, so they fill the barrel and actually put some scrubbing pressure on the fouling rather than just sliding through.
Where the .375 Nylon Bore Brush Earns Its Keep
Nylon is the go-to when you're running ammonia or copper solvents. Those cleaners will eat away at a bronze brush over time, but they leave nylon bristles alone, so this brush holds up run after run through the bore. That makes it a solid pick for anyone shooting big-bore rounds like .375 H&H, .375 Ruger, or .376 Steyr who wants a brush that keeps its shape through repeated soaks and passes.
Fits the Rods You Already Own
Each brush uses a standard 8-32 male thread, which is the fitting you'll find on the vast majority of rifle cleaning rods, jags, and handles out there. If you've got a Dewey rod, a Tipton, a Pro-Shot, or just about anything else on the bench, these thread right on with no adapter fuss. The closed-loop tip keeps the bristles anchored so nothing frays loose mid-stroke.
A Dozen Reasons to Stock Up
Running a full 12-pack is the practical move. Brushes are wear items, and a nylon one that's been mashed through a barrel a few dozen times loses its bite. Having eleven backups in the drawer means you're never tempted to keep using a tired brush that isn't doing its job. Keep them with your solvent, patches, and rod, and your .375 cleaning kit is squared away for the long haul.
Key Specifications
- Manufacturer: Sinclair International
- MPN / Model: BB375N
- UPC: 608060400251
- Caliber: .375 Caliber
- Bristle Material: Nylon
- Thread Pattern: 8-32 Male
- Tip Style: Closed Loop
- Solvent Resistance: Resists ammonia and oil-based cleaners
- Quantity: 12 Pack
- Application: Rifle bore cleaning
What’s Included
- 12 Sinclair International .375 caliber nylon rifle bore brushes with 8-32 male thread
Frequently Asked Questions
What caliber is this Sinclair nylon bore brush made for?
It's sized for .375 caliber rifle bores, which covers popular big-bore chamberings like .375 H&H, .375 Ruger, and .376 Steyr. Sinclair labels it as their 37 caliber brush, but that's just their shorthand for the .375 size. Match your brush to your actual bore diameter and you're good to go.
Will these brushes fit my cleaning rod?
Yes. Each brush uses the standard 8-32 male thread found on the large majority of rifle cleaning rods, jags, and handles. Brands like Dewey, Tipton, and Pro-Shot all use this fitting, so these thread right on without any adapter.
Why choose nylon bristles over bronze?
Nylon bristles shrug off ammonia and copper solvents that will slowly eat away at a bronze brush. That means a nylon brush holds its shape and keeps working through repeated cleaning sessions. It's also gentler on the bore finish while still scrubbing out powder residue and light fouling.
Why does this come in a 12-pack?
Bore brushes are wear items, and a nylon brush that's been run through a barrel many times loses its stiffness and scrubbing bite. Buying a dozen at once gives you a season's worth of fresh replacements so you're never tempted to keep using a tired one. It works out to a better value than grabbing them one at a time too.





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