Brownells Aircraft Counterbore, 9/16'', Piloted

The Brownells Aircraft Counterbore with 9/16" cutter and pilot system is a purpose-built gunsmithing tool for shooters who want to bed their rifles properly. If you're planning to add pillar bedding to a rifle stock, this counterbore lets you drill clean, centered holes through existing screw holes without the risk of cutter drift—the integral pilot keeps everything true. That means you can focus on the job instead of babying the tool or worrying about a ruined stock.

Pillar bedding is one of the best ways to improve a rifle's accuracy and durability by providing solid, non-compressing support at the recoil lug and magazine box area. A counterbore is the right tool for the job because it creates a clean, properly sized pocket for the bedding block or pillar. The 9/16" size covers a broad range of common rifle stocks, so this single cutter handles what might otherwise require multiple specialized bits.

The piloted design means you're not relying on hand steadiness or a perfectly aligned drill press; the pilot rides in the existing screw hole and guides the cutter. The interchangeable pilot system also adds versatility—if you already own other Brownells counterbores with compatible pilots, you can swap components to maximize your toolkit without redundancy.

Key Features

• 9/16" cutter size for common rifle stock pillar bedding applications
• Integral pilot system prevents cutter wandering and ensures centered drilling
• Interchangeable pilot design increases tool versatility
• Aircraft-grade construction built to handle the demands of gunsmithing work

Specifications

Frequently Asked Questions

What is a piloted counterbore used for?

A piloted counterbore is designed to drill clean pockets in rifle stocks for pillar bedding installations. The pilot rides in the existing screw hole to guide the cutter and prevent drift, ensuring your bedding blocks sit true and centered.

Will this counterbore fit my rifle stock?

The 9/16" cutter accommodates most common rifle stock applications that use standard-sized screw holes. If your stock uses non-standard hole sizes or spacing, verify compatibility with your bedding block or pillar kit before ordering.

Can I use different pilots with this cutter?

Yes. Brownells counterbores feature an interchangeable pilot system, so if you own other compatible counterbore cutters, you can swap pilots between them to maximize versatility without buying redundant tools.