Rearden Manufacturing Group Llc Spb Muzzle Brake 0.5 5/8-24 Threads Square Shoulder Black

The Rearden SPB muzzle brake is a precision-engineered, Plan B-compatible muzzle device built for shooters running suppressor-ready AR platforms and precision rifles. With its 5/8-24 thread pattern and square shoulder design, this brake integrates seamlessly into modular suppressor systems that use Plan B or Atlas-compatible mounts. The 17-4 PH stainless steel construction finished in black nitride delivers corrosion resistance and a durable, tight-tolerance seal—critical when stacking suppressors and brakes for zero shift and reliability in the field or at the range.

If you're building a suppressed rifle or upgrading an existing setup, thread fitment and muzzle device alignment directly affect suppressor performance and shooter experience. The SPB's square shoulder seats positively against your barrel, and the included shims let you dial in the system for perfect concentricity with an alignment rod during installation. The black nitride finish is harder and more corrosion-resistant than standard parkerizing, important for keeping threads and tapers clean and the seal tight between removable suppressors and the brake itself.

Installation matters: torque the brake to 15–25 ft-lbs and apply Rocksett to lock it in place. When you install a suppressor or Plan B adapter, clean threads and tapers, then torque to 10 ft-lbs and verify alignment. This methodical approach prevents drift, maintains zero, and ensures the modular system works as designed. Rearden's SPB is made for builders who understand that precision suppressors demand precision mounting.

Key Features

• 5/8-24 thread pattern for common suppressor hosts
• Square shoulder design for positive barrel contact and consistent alignment
• Plan B and Atlas/Atlas XL adapter compatible
• 17-4 PH stainless steel with black nitride finish (67 HRC surface hardness)
• Includes alignment shims for system concentricity tuning
• Approximately 1.050" overrun on Atlas Adapter mounts

Specifications

Frequently Asked Questions

What suppressors and mounts does this SPB work with?

The SPB is designed for Plan B type mounts and Atlas/Atlas XL compatible adapters. It features a 5/8-24 thread pattern and square shoulder for consistent, repeatable mounting on suppressor systems built around those platforms. Always verify your specific suppressor or adapter is Plan B or Atlas-compatible before purchase.

Do I get shims with this brake?

Yes, alignment shims are included to help dial in system concentricity—except on SR25/M110 or 11/16×24 configurations. Use these shims with an alignment rod during installation to ensure your entire suppressor stack runs true.

How tight should I torque this to my barrel?

Torque the muzzle brake to your barrel at 15–25 ft-lbs, then apply Rocksett to lock the threads permanently. When attaching a suppressor or Plan B adapter to the brake, torque to 10 ft-lbs. Clean threads and tapers before each assembly, and always verify alignment with an alignment rod.

Why does the nitride finish matter?

Black nitride (67 HRC surface hardness) creates a tighter, more corrosion-resistant seal than standard finishes. This matters because a tight, clean connection between the brake, threads, and suppressor reduces leakage and maintains suppression and zero shift over repeated cycles.