Upgrade your shotgun tooling with the Clymer BUSHING, 12 GA, .729 (18.5MM) – B729X1, a precision bronze shotgun bushing engineered for professional gunsmiths and serious shotgun tinkerers. Designed to work with Clymer shotgun barrel facer / shotgun bushing systems, this 12-gauge bushing provides a precise, concentric fit on .729" (18.5mm) bores, ensuring proper alignment for muzzle-facing and other critical barrel work. Brownells UK+2Brownells UK+2
Precision 12 Gauge Shotgun Bushing for .729" (18.5mm) Bores
The Clymer B729X1 bushing is purpose-built for 12 gauge shotguns with a nominal bore diameter of .729" (18.5mm). Brownells UK+1
By matching the bore size closely, this bushing helps keep your facing tool running true to the bore, which is key when you’re cleaning up muzzles, truing crowns, or performing other precision barrel-end operations.
Durable Bronze Construction for Long Shop Life
Clymer builds this 12 ga bushing from high-quality bronze, chosen for its ideal balance of strength, wear resistance, and “forgiving” contact with steel barrels and tooling. Brownells UK+2Brownells Schweiz+2
Material: Shotgun bronze bushing
Resists galling while still being gentle enough to protect barrel steel
Designed for repeated installation and removal in a busy gunsmithing environment
Bronze bushings are widely favored in precision alignment applications, and Clymer’s design brings that same reliability to shotgun barrel-facing setups.
Designed for Universal Shotguns & Professional Barrel Work
This bushing is cataloged by Brownells and others as fitting “Universal Shotguns”, making it a go-to option for shops that service a wide range of 12 gauge platforms. Brownells UK+2Brownells Iberica+2
Ideal for use with:
Clymer shotgun barrel facers / facing tools
Muzzle truing and cleanup on field, competition, and tactical shotguns
General barrel-end maintenance that demands proper bore-to-tool alignment
If your barrel measures at or near .729" (18.5mm), this Clymer bushing helps your facing tools track the bore instead of the outside profile—an important factor when working on tapered or irregular barrels.
Compact, Shop-Friendly Dimensions
While extremely simple in concept, the B729X1 is built to practical, shop-ready dimensions that make it easy to incorporate into your workflow:
Compact overall length around 1" and diameter sized specifically for 12 ga work bushings Firearms Parts Shop+1
Lightweight (approx. 0.045 kg shipping weight) but robust enough for repeated use Brownells UK+1
Small enough to keep several calibers and sizes organized in a single bushing tray or drawer
This compact profile lets you swap bushings quickly as you move from one shotgun to another, improving shop efficiency.
Made in the USA – Clymer Quality You Can Trust
Clymer has a longstanding reputation for high-precision gunsmithing tools, and this 12-ga .729" bushing is built to that same standard:
Made in the USA for consistent quality and dimensional control Brownells UK+1
Part of the Clymer Shotgun Bushings family, designed to integrate seamlessly with compatible Clymer tooling systems Brownells UK+2Brownells Österreich+2
Backed by the same brand trusted for chamber reamers, gauges, and precision shotgun tools worldwide
When your work depends on correct alignment and clean finishes, having a properly sized Clymer bushing is just as important as the cutting tool itself.
Key Specs – Clymer BUSHING, 12 GA, .729 (18.5MM) B729X1
From Clymer and major distributors: Brownells Česká republika+4Brownells UK+4Brownells UK+4
Brand: Clymer
Product Type: Shotgun Bronze Bushing
Gauge: 12 Gauge
Bore Diameter Fit: .729" (18.5mm)
Material: Bronze
Intended Use: For Clymer shotgun barrel facer / shotgun bushing systems
Weapon Type: Universal shotguns
Mfr Part Number: B729X1
Common Retail SKU: 184252729
Country of Origin: Made in USA
Why Choose the Clymer 12 GA .729 (18.5mm) Bushing?
Perfectly matched to 12 ga .729" bores for accurate, concentric tool alignment
Bronze construction offers durability while helping protect barrel and tool surfaces
Works with Clymer shotgun barrel facers and bushing-based tools, making it easy to integrate into existing setups
Suitable for professional gunsmiths, shotgun builders, and advanced DIYers who demand repeatable, precision results
Backed by Clymer’s reputation for high-end gunsmithing equipment
If you regularly perform muzzle-facing, crown cleanup, or other barrel-end operations on 12 gauge shotguns, the Clymer BUSHING, 12 GA, .729 (18.5MM) B729X1 is the correct, bore-matched bushing you’ll reach for again and again.
The End
