The ANGLE BLADE EXPANDING CHOKE REAMER – “B” Adjustable Reamer (UPC 736681005200, Product No. 170531002) from Chadwick & Trefethen is a professional-grade, fully adjustable choke reamer designed for precision work on a wide range of shotgun gauges. Featuring an innovative angle-blade design that virtually eliminates chatter and ensures each cut is clean, smooth, and controlled, this tool is a must-have for gunsmiths and serious shotgun enthusiasts who demand exact choke dimensions and match-grade fits. Brownells+2Brownells Česká republika+2
Engineered as a “B” Adjustable Reamer, it delivers the versatility to fine-tune shotgun chokes or fit 1911 barrel bushings with professional accuracy—all from a single, compact, expanding tool. Brownells+2Brownells Česká republika+2
Key Features – Angle Blade Expanding Choke Reamer “B” (170531002)
Smooth, Chatter-Free Cutting with Angle-Blade Design
Unlike generic adjustable reamers, the Angle Blade Expanding Choke Reamer “B” uses a carefully engineered angle-blade geometry to eliminate chatter and give you a smoother, more controlled cut. Brownells Česká republika+2Brownells+2
Benefits of the angle-blade design:
Clean, controlled cutting that produces professional-quality surfaces inside the choke
Reduced risk of gouging or spiral chatter marks in the bore
More consistent results when opening or blending choke constrictions
Whether you’re working on a classic side-by-side, a field pump, or a modern semi-auto, smooth cutting is critical to preserve pattern quality and barrel integrity.
Fully Adjustable – One Tool, Many Choke Jobs
As a “B” Adjustable Reamer, this tool features an expanding body that allows you to fine-tune its diameter within its working range (.531" – .593"). Brownells+2Brownells UK+2
That adjustability lets you:
Open tight chokes step-by-step instead of jumping directly to a fixed final size
Blend choke transitions for improved pattern uniformity
Dial in a specific constriction for trap, skeet, sporting clays, upland, waterfowl, or turkey loads
Because it’s not limited to a single diameter, the “B” reamer is an incredibly versatile tool for a shop that sees multiple guns and gauges.
Multi-Gauge Capability – 10, 12, 16, 20, 28 & .410
This Angle Blade Expanding Choke Reamer line is designed for 10, 12, 16, 20 and 28 gauge shotguns, plus .410 choke reaming, when used with the proper setup and choke tooling. Brownells+2Brownells Česká republika+2
In particular, the “B” size reamer is ideal in the .531"–.593" range, making it well-suited for:
Many intermediate constrictions in 12 and 16 gauge
Certain stages of 10, 20, 28 and .410 choke work as part of a progressive reaming process with other sizes (A, C, D, E) Brownells+2Brownells+2
For shops working across multiple gauges, this multi-purpose coverage keeps your tooling footprint efficient and cost-effective.
Also Excellent for 1911 Barrel Bushing Fitting
A unique advantage of the A and B Angle Blade Expanding Choke Reamers is that they’re especially useful for fitting 1911 Auto barrel bushings. Brownells+2Brownells Česká republika+2
With its expansion range and smooth, chatter-free cut, the “B” reamer can:
Precisely ream 1911 barrel bushings to achieve a tight, match-grade barrel-to-bushing fit
Help improve accuracy and lockup consistency on custom or upgraded 1911 pistols
If you work on both shotguns and 1911s, this tool does double duty—making it a smart investment for any well-rounded gunsmith.
Professional-Grade Construction & Support Tooling
The Angle Blade Expanding Choke Reamer “B” is built from high-quality steel, intended for repeated use in professional environments. Brownells Česká republika+1
For best results, manufacturers and distributors recommend pairing it with:
Used with quality cutting oil and correct technique, this reamer delivers long tool life and repeatable results day in and day out.
Ideal Users & Applications
The ANGLE BLADE EXPANDING CHOKE REAMER – “B” Adjustable Reamer (736681005200) is ideal for:
Professional gunsmiths offering choke modification, pattern tuning, or fixed-to-screw-in conversions
Shotgun specialists who demand tailored choke constrictions for competition, hunting, or custom builds
1911 pistol smiths looking for a versatile reamer to fit barrel bushings with match-grade precision
Experienced hobbyists who want to take control of their shotgun’s performance under the guidance of proper references and best practices
With its combination of smooth cutting, adjustability, and multi-gauge capability, it’s one of the most efficient ways to add serious choke and bushing work to your tooling arsenal.
Technical Specifications – Angle Blade Expanding Choke Reamer “B” (170531002)
Why Choose the Angle Blade Expanding Choke Reamer “B” (736681005200)?
If you’re searching for “Angle Blade Expanding Choke Reamer 736681005200”, “Chadwick & Trefethen B Adjustable Reamer 170531002”, or a professional choke reamer for 10–28 gauge and .410, this tool stands out because it offers:
Angle-blade, chatter-free cutting for clean, controlled metal removal
Fully adjustable expansion in the .531"–.593" range for precise choke and bushing fits
Multi-gauge versatility for a wide variety of shotgun choke reaming tasks
Added value as a 1911 barrel bushing fitting tool
Trusted Chadwick & Trefethen quality, backed by widespread use in gunsmithing shops
For professional choke alteration, fine pattern tuning, or match-grade 1911 work, the ANGLE BLADE EXPANDING CHOKE REAMER “B” Adjustable Reamer (UPC 736681005200) is a proven, shop-ready solution that belongs in every serious gunsmith’s toolkit.
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