Description
A lot of synthetic and polymer forends are hollow and thin-walled, which means there's nothing solid behind the wood or plastic for a sling swivel stud to grab. That's exactly the problem the Harris No. 2 Adapter Flange Nut solves. This is the big-headed flange nut that sits inside the forend and spreads the load across a wider surface, giving your swivel stud something firm to thread into so your Harris bipod mounts up without wallowing out over time.
The flat flange measures 5/8 inch wide by 1 3/8 inches long, and the shank runs 5/16 inch in diameter with a 10-32 threaded hole. The flat backer design is meant for forends with a flat inside surface, which covers a huge range of factory synthetic stocks. Installation is straightforward for anyone comfortable with a drill: you locate your spot, drill your hole, slip the flange in from the inside, and thread in the stud. Folks have put these on everything from Mossberg rimfires to M1A rifles and Thompson/Center break-actions with about as much fuss as a quick range-day project.
Why the No. 2 Flange Nut Beats a Clamp-On
Clamp-on bipod adapters can shift barrel harmonics and loosen up under recoil. Going with a stud-mounted setup like this Harris flange nut keeps everything anchored to the forend where it belongs, so your point of impact stays consistent shot after shot. Once it's in, it's in.
What Comes with the Harris No. 2 Adapter
Harris includes the sling swivel stud and washer along with the flange nut, so you've got the complete hardware to make one clean attachment point. These are genuine Harris factory parts built to the same tolerances as their bipods, which is why they seat and fit the way they should. Pair it with any Harris bipod and you've got a rock-steady front rest for the bench or the field.
Key Specifications
- Manufacturer: Harris Engineering
- Manufacturer Part Number: NO. 2
- UPC: 051156000024
- Type: Flat flange nut bipod adapter
- Designed For: Hollow plastic / synthetic forends
- Flange Dimensions: 5/8 in. wide x 1 3/8 in. long
- Shank Diameter: 5/16 in.
- Threaded Hole: 10-32
- Includes: Sling swivel stud and washer
- Shipping Weight: 0.05 lbs
What’s Included
- No. 2 flat flange nut adapter
- Sling swivel stud
- Washer
Frequently Asked Questions
What is the Harris No. 2 Adapter Flange Nut used for?
It creates a solid attachment point for a sling swivel stud on hollow, thin-walled synthetic or plastic forends that don't have anything firm behind them. The wide flange spreads the load so the stud stays put and gives your Harris bipod a dependable place to mount. It's the go-to fix when your rifle didn't come with a factory swivel stud up front.
Does the No. 2 flange nut come with the swivel stud?
Yes. Harris includes both the sling swivel stud and a washer along with the flange nut, so you have the complete hardware to make one clean attachment point. You won't need to source any extra pieces to get it installed.
How do I install the Harris No. 2 Adapter?
You'll drill a hole in the forend where you want the stud, slip the flange in from the inside, and thread the swivel stud into the 10-32 hole with the washer. Most people knock it out in a short session with basic tools, though some forends need a little Dremel or file work to seat the flange flat. Always make sure your firearm is unloaded before you start.
What's the difference between the No. 2 and the No. 2R adapter?
The No. 2 has a flat flange meant for forends with a flat inside backing surface. The No. 2R has a radiused flange designed for wood or polymer forends that curve under gas tubes. Pick the flat No. 2 if the inside of your forend is flat.



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