A Keystone Sporting Arms thread adapter bridges the gap between incompatible barrel threads, letting you swap uppers, barrels, or muzzle devices across different firearms without permanent modification. The 3/8x24 to 1/2x28 thread adapter converts smaller 3/8x24 male threads to the larger 1/2x28 standard, making it useful for builders, gunsmiths, and shooters who need to adapt components across rifle platforms or suppress different calibers with a universal suppressor platform.

This adapter includes a thread protector cap, keeping the threads clean and safe during storage or transport—a practical touch that saves you from tracking down a loose cap when you need to swap barrels or muzzle devices at the range or in the field. Keystone's straightforward engineering means you get a reliable adapter with no unnecessary complexity.

Whether you're building a precision rifle, experimenting with different uppers, or consolidating your suppressor collection, a quality thread adapter removes friction from the process. Keep one in your range bag or toolkit for those moments when your barrel thread and your silencer (or muzzle brake) don't align.

Key Features

• Converts 3/8x24 male threads to 1/2x28 female threads
• Includes protective thread cap for safe storage and transport
• Straightforward, no-fuss design from a trusted components manufacturer

Specifications

Frequently Asked Questions

What barrel threads does this adapter fit?

This adapter accepts barrels or muzzle devices with 3/8x24 male threads and converts them to accept 1/2x28 components. Check your barrel's thread spec before ordering to ensure compatibility.

Can I use this with a suppressor?

Yes, if your suppressor is threaded 1/2x28, this adapter lets you mount it to a 3/8x24 barrel. Always verify your suppressor's specifications and ensure threads are clean before assembly.

What's included with the adapter?

The adapter comes with a thread protector cap to keep the threads clean and protected when not in use.