Rearden Spb Mb .280 1/2-28 Nitride

The Rearden SPB muzzle brake in .280 caliber with 1/2-28 threading and black nitride finish is purpose-built for shooters running Plan B-type suppressor mounts. This brake is engineered to work as part of a complete suppressor system, offering a hardened nitride surface (67 HRC) that promotes a secure, tight seal when your can is mounted. The 17-4 PH H900 stainless steel construction means it'll stand up to the heat and recoil of repeated shooting, whether you're at the range or in the field.

Rearden designed the SPB to pair with both Atlas and Atlas XL compatible mounts—no overrun on the XL adapter version. That compatibility matters: it means you can swap suppressors and adapters without fumbling with different quick-detach systems. The included shims give you fine-tuning options during installation, letting you dial in proper alignment before you're locked in. Keep in mind that this brake is intended for use with Plan B-type suppressors; using it on a Q suppressor voids the warranty, so verify your setup before you shoot.

Proper installation is non-negotiable with any muzzle device. Use an alignment rod during setup to confirm the entire system sits square, clean all mating surfaces thoroughly, and torque the brake to 15–25 ft-lbs with Rocksett threadlocker. When you mount your suppressor, clean the threads and tapers, then torque the can to 10 ft-lbs. That discipline at assembly time translates to confidence downrange and a seal that actually holds.

Key Features

• 17-4 PH H900 stainless steel for durability and heat resistance
• Black nitride finish (67 HRC surface hardness) ensures a tight, reliable seal
• Compatible with Plan B-type suppressor mounts and Atlas/Atlas XL adapters
• Includes shims for precise alignment during installation
• .280 caliber with 1/2-28 thread pitch
• Designed to work as part of a complete suppressor system

Specifications

Frequently Asked Questions

Is the Rearden SPB compatible with my suppressor?

The Rearden SPB is designed for Plan B-type mounts. If your suppressor uses a Plan B-compatible mounting system and your barrel is threaded 1/2-28, this brake will work. However, using it with a Q suppressor voids the warranty, so confirm your suppressor's mount type before purchase.

What's included with the brake?

The Rearden SPB comes with shims for alignment tuning during installation. Note that shims are not included with SR25/M110 or 11/16×24" variants.

How do I install this muzzle brake correctly?

Use an alignment rod to verify the entire system is square. Clean all mating surfaces, torque the brake to the barrel at 15–25 ft-lbs, and apply Rocksett threadlocker. When mounting your suppressor, ensure threads and tapers are clean, then torque the can to 10 ft-lbs. Proper alignment is critical for seal integrity and reliable function.

Does the nitride finish affect how the brake performs?

The black nitride finish (67 HRC hardness) promotes a tighter seal when your suppressor is mounted, which is why proper torquing and Rocksett application during initial setup is especially important.