What are the specific physical dimensions and radius curve of the Harris #2R flange nut?

The Harris #2R flange plate measures approximately 5/8 inch by 1-3/8 inch and features a 3/4-inch radius curve. It is specifically engineered from heat-treated steel with a black finish to contour smoothly around internal tubular magazines or gas systems.

What stock thickness and drill sizing are required to properly install the Harris #2R adapter?

The manufacturer specifies that your firearm fore-end must be at least 3/8 inch thick at the installation point. Installation requires drilling a pilot hole followed by a 5/16-inch final clearance hole for the swivel stud shank, along with internal inletting and epoxy bedding for proper load distribution.

Is the Harris #2R suitable for flat-bottomed stocks or modern chassis systems?

No, if your stock interior is flat rather than curved around a gas tube or magazine, the Harris No. 2 flat flange nut should be used instead. Additionally, modern chassis systems or handguards featuring Picatinny or M-LOK interfaces require direct rail adapters rather than this internal flange nut.

Are there any Australian regulatory compliance requirements for purchasing this firearm accessory?

The Harris #2R Adapter is a purely mechanical firearm hardware component and is fully legal for retail and ownership across all Australian states and territories without restriction. Electrical compliance standards such as 240V mains power ratings or SAA/RCM certifications are not applicable to this item.

Radiused Flange Nut - Harris HADAP2R

The Harris Engineering #2R Adapter Radiused Flange Nut (MPN: HB2R / HADAP2R) is a specialised internal stock adapter designed to add a standard sling swivel stud to wood or polymer rifle fore-ends. Engineered to fit inside the forearm channel, it features a curved steel baseplate that clears internal mechanical components such as tubular magazines and gas tubes, allowing shooters to securely mount any standard Harris bipod or quick-detach sling.

Key Features

Radiused Steel Baseplate: Machined with a 3/4-inch (19.05 mm) radius curve on a 5/8 in × 1-3/8 in (15.9 mm × 34.9 mm) heat-treated steel flange to contour seamlessly around internal magazine tubes or gas assemblies.
Flush-Mount Internal Anchor: Sits internally within the stock channel to provide high load-bearing support for threaded swivel studs without obstructing the barrel or operating system.
Durable Construction: Made from all-steel, heat-treated material with a protective black finish, weighing approximately 45 to 60 grams (0.10 to 0.13 lbs).
Universal Harris Bipod Compatibility: Installs an external standard stud anchor compatible with the entire range of standard Harris bipod mounting clamps.

Specifications

Product: Harris #2R Adapter Radiused Flange Nut
Material: Heat-treated steel with black finish
Flange Dimensions: 5/8 in × 1-3/8 in (approx. 15.9 mm × 34.9 mm)
Flange Curve: 3/4-inch (0.75 in / 19.05 mm) radius
Minimum Stock Thickness Required: 3/8 inch (approx. 9.5 mm)
Clearance Hole Requirement: 5/16 inch (approx. 7.9 mm)
Weight: 0.10 to 0.13 lbs (approx. 45–60 g)
Power Requirements: None (passive mechanical firearm hardware)

Who is the Harris #2R Radiused Flange Nut Adapter for?

Hunters and Target Shooters Modifying Wood Stocks with Tubular Magazines or Gas Tubes — Requires a 3/4-inch radius curve across a 5/8 in × 1-3/8 in flange to clear internal obstructions while establishing a stable bipod anchor point.
Gunsmiths Installing Sling Swivel Studs on Classic or Semi-Automatic Rifle Platforms — Delivers a solid internal anchor requiring a minimum 3/8 inch (9.5 mm) stock thickness and a 5/16-inch clearance hole to properly distribute bipod recoil forces.

Less suitable for: Stocks with flat internal forearm channels (which require a flat flange nut), hollow polymer fore-ends with a wall thickness under 3/8 inch (which require thin-stock backing plates), or modern chassis systems with Picatinny or M-LOK interfaces (which require direct-attach rail adapters).

SKU	HR40926LP
Model #	HADAP2R
Brand	Harris
Shipping Weight	1.0000kg

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Harris Hadap2r Radiused Flange Nut Steel Wood Fore-End Adapter

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