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Ar-15/M16 Gas Block Taper Pin Reamer - Taper Pin Reamer
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$42.99
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SKU: 080000674
Overview
This reamer is intended for finishing gas block and front sight tower pin holes so they match the standard A2 retaining pin shape. It can be used to clean up existing holes or taper newly drilled ones, helping produce a secure fit and proper sight tower alignment. Built as a high-speed steel 2/0 reamer, it is a focused shop tool for AR-15/M16 gas block and front sight tower work where precise pin-hole finishing matters.
Why Hunters Choose the Brownells
Precisely Finishes
Gas block and front sight
Tapered Match
Standard A2 gas block retaining
Helps Clean
Up existing holes or taper
Supports Secure
Fit and precise sight tower
High-speed Steel
Reamer from Brownells
Key Features
- Precisely finishes gas block and front sight tower pin holes.
- High-speed steel reamer matched to the standard A2 gas block retaining pin.
- Cleans up existing holes or tapers newly drilled holes.
- Helps ensure a positive, secure fit and precise sight tower alignment.
- 2/0 reamer with tapered dimensions from .1137" to .1462".
- Includes a 2A 3/4" handle, 5/8" in diameter.
Best Used For
- Armorers finishing AR-15/M16 gas block or front sight tower pin holes for proper alignment.
- Builders cleaning up existing taper pin holes before installing a standard A2 retaining pin.
- Users tapering newly drilled holes to achieve a secure, precise pin fit.
- Bench work on gas block and sight tower installations where controlled hole finishing matters.
Specifications
| Handle Diameter | 5/8 in (16 mm) |
|---|---|
| Handle Length | 3/4 in (70 mm) |
| Reamer Material | High-speed steel |
| Reamer Size | 2/0 reamer |
| Shank O D | 0.1462 in (3.7 mm) |
| Tip O D | 0.1137 in (2.8 mm) |
Pros
- Precisely finishes gas block and front sight tower pin holes
- Tapered to match the standard A2 gas block retaining pin
- Helps clean up existing holes or taper newly drilled holes
- Supports secure fit and precise sight tower alignment
- High-speed steel reamer from Brownells
- Includes specified reamer dimensions for consistent setup
Considerations & Trade-offs
- This is a purpose-built reamer for finishing gas block/front sight tower pin holes, so it is not a general-purpose drilling or installation tool.
- The taper is matched to the standard A2 gas block retaining pin, which means it is intended for that specific pin geometry rather than a broad range of pin sizes.
- Because it is a high-speed steel reamer, using it correctly and with care is important to avoid removing too much material from the hole.
- The tool is designed to clean up existing holes or taper newly drilled ones, so it assumes the user already has the hole started and properly positioned.
Suggested Comparisons
- AR-15/M16 gas block installation tools
- Front sight tower pinning tools
- Taper pin reamers
- Firearm armorer's hand tools
Suggested Accessories
- Bench vise
- Drill bits
- Pin punch set
- Cutting oil
Frequently Asked Questions
What is this reamer used for on an AR-15/M16 gas block or front sight tower?
It is used to precisely finish gas block/front sight tower pin holes. The description says it cleans up existing holes or tapers newly drilled holes to help ensure a positive, secure fit and precise alignment of the sight tower.
What type of pin is this reamer made to match?
It is precisely tapered to match the shape of the standard A2 gas block retaining pin.
What material is the reamer made from?
The reamer is high-speed steel.
What are the listed taper dimensions?
The reamer tapers from .1137 in. (2.8 mm) O.D. at the tip to .1462 in. (3.7 mm) O.D. near the shank.
Does the product listing provide complete tool and handle specifications?
It provides some specifications: the reamer is listed as a 2/0 reamer, and the handle is listed as 2A, 3/4 in. (70 mm) long and 5/8 in. (16 mm) in diameter. No other specifications are provided in the source data.