OSS RAD Direct Thread Adapter 5/8-24 – Precision Fit for Suppressor Systems

The OSS RAD Direct Thread Adapter 5/8-24 is a precision muzzle device mounting solution engineered for shooters running suppressor systems on fixed-barrel platforms. If you're building or upgrading a suppressed rifle and need a solid, repeatable connection between your barrel and suppressor, this direct thread adapter bridges the gap with industrial-grade reliability. Built from 17-4 stainless steel and finished in black nitride, it's built to handle the heat and pressure cycles that come with suppressed fire without degrading.

This adapter threads onto barrels with 5/8-24 muzzle threads and accepts suppressors with 1.125X28 internal threads—a common pairing in precision rifle and tactical platforms. The wrench-flat design lets you torque it down securely and repeatably, so you get the same zero and suppressor fit shot after shot. The nitride finish adds a layer of corrosion resistance, important if you're shooting in wet conditions or storing the gun long-term. Because it's designed for fixed-barrel systems only, you get a rock-solid platform without the complexity of unlocking mechanisms.

Whether you're assembling a precision long-range rifle, a dedicated suppressed carbine, or upgrading an existing fixed-barrel platform, the RAD adapter is straightforward to install and engineered to stay put. It's the kind of component that disappears into your setup once you know it's there—no rattle, no creep, just a clean interface between your barrel and your suppressor.

Key Features

• 17-4 stainless steel construction with heat-treatment for durability
• Black nitride finish for wear and corrosion resistance
• Wrench flats for secure, repeatable installation and removal
• Designed exclusively for fixed-barrel systems
• Compatible with 1.125X28 suppressor threads

Specifications

Frequently Asked Questions

What suppressor thread size does this adapter accept?

The OSS RAD Direct Thread Adapter accommodates suppressors with 1.125X28 internal threads, a standard configuration for many precision rifles and tactical platforms.

Can I use this on a semi-automatic rifle with a reciprocating or unlocking barrel?

No. This adapter is designed for fixed-barrel systems only and is not suitable for use on unlocking or reciprocating barrels. Check your platform's barrel design before ordering.

How do I install and secure this adapter?

The adapter features wrench flats that allow you to thread it onto your 5/8-24 barrel and tighten it securely with a wrench for a repeatable, solid fit. Torque specifications should be followed per your platform or suppressor manufacturer's guidance.

What's the advantage of the black nitride finish?

Black nitride provides enhanced resistance to wear and corrosion, helping the adapter maintain a clean, snug fit over extended use and in various weather conditions.