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J-BA(R) Bore Compound & Kroil - J-B Bore Compound & Kroil Kit
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$29.96
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SKU: 083065000
Overview
This cleaning kit is designed for shooters who want a straightforward way to address fouling in a rifle bore. Kroil is used first to help loosen buildup, followed by J-B Compound to work on stubborn moly residue, powder, and copper jacket fouling, with a final Kroil pass leaving a rust preventive film. It is a practical choice for maintenance routines where careful bore cleaning matters, especially when accuracy is the priority. The kit combines two products in one package, offering a simple setup for regular barrel care without adding extra steps or guesswork.
Why Hunters Choose the Brownells
J-b Compound
Kroil in one cleaning kit
Bore Cleaning
Fouling removal steps
Includes Kroil
For loosening barrel fouling before
J-b Compound
Targets stubborn moly, powder, and
Final Kroil
Pass leaves a rust preventive
Key Features
- Includes J-B Bore Compound and Kroil in one cleaning kit.
- Kroil is used first to loosen barrel fouling before wiping clean.
- J-B Compound is used to remove stubborn moly residue, powder, and copper jacket fouling.
- Final Kroil pass leaves a rust preventive film in the bore.
- J-B jar contains 2 oz. net contents.
- Kroil can contains 8 fl. oz.
Best Used For
- Hunters maintaining rifles with heavy barrel fouling after extended range sessions
- Shooters who want a two-step bore cleaning routine for stubborn residue and jacket fouling
- Users looking for a bore treatment that finishes with a rust preventive film
- Owners of precision rifles who prefer a dedicated cleaning kit for regular maintenance
Specifications
| Country Of Origin | Brownells |
|---|---|
| J B Net Contents | 2 oz. (57 g) jar |
| Kroil Net Contents | 8 fl. oz. (237 ml) can |
Pros
- Combines J-B compound and Kroil in one cleaning kit
- Designed for bore cleaning and fouling removal steps
- Includes Kroil for loosening barrel fouling before wiping
- J-B compound targets stubborn moly, powder, and copper residue
- Final Kroil pass leaves a rust preventive film
- Compact kit includes 2 oz J-B jar and 8 fl. oz. Kroil can
Considerations & Trade-offs
- This is a bore-cleaning kit, so it adds a two-step cleaning routine rather than a single all-purpose solvent.
- The kit is aimed at removing stubborn fouling and residue, which means it is more specialized than a basic patch-and-clean approach.
- Kroil is described as leaving a rust preventive film, but the product details do not specify long-term protection duration or coverage limits.
- The kit includes separate J-B Compound and Kroil containers, so it requires keeping track of two products and their different uses.
Suggested Comparisons
- Bore cleaning solvents and penetrants
- Abrasive bore cleaning compounds
- Gun cleaning kits
- Rust preventive bore treatments
Suggested Accessories
- Cleaning patches
- Bore brush
- Gun cleaning rod
- Gun cleaning solvent
Frequently Asked Questions
What comes in the J-B Bore Compound & Kroil Kit?
The kit includes J-B Bore Compound in a 2 oz. (57 g) net contents jar and Kroil in an 8 fl. oz. (237 ml) can.
What is this kit used for?
According to the product description, it is used for bore cleaning: Kroil is used first to help loosen barrel fouling, J-B Compound is then used to remove stubborn moly residue, powder, and copper jacket fouling, and Kroil is used again as a final pass.
Is this a one-step bore cleaner?
No. The description presents it as a two-product cleaning process rather than a single-step cleaner: Kroil is used to loosen fouling, J-B Compound is used to remove buildup, and Kroil is used again afterward.
Does the product description specify what firearms or calibers it fits?
No. The provided data does not list firearm type, caliber, or any fitment details.
Does the description claim any performance results?
It says the combination has been written up in several accuracy publications and describes its intended cleaning use, but it does not provide specific measured performance results or comparative claims.