Surefire SOCOM 5.56 & 6mm ARC Muzzle Brake, 5/8×24
This variant of the SFMB is designed for 6mm ARC rifles, or 5.56 weapons with a barrel threaded in 5/8×24.
SureFire SFMB muzzle brake suppressor adapters greatly reduce both recoil impulse and muzzle rise so that your weapon tracks straight back, keeping you on target for faster shot-to-shot recovery. Our proprietary Impulse Diffusion design minimizes side blast and rear-directed concussion effects. Precision machined from U.S. mill-certified heat-treated stainless steel bar stock and DLC-coated for extreme durability, they are available for a variety of weapon calibers and muzzle thread specs, and every SFMB serves as a rock-solid mounting adapter for SureFire’s combat-proven SOCOM Series Fast-Attach suppressors.
The SFMB design incorporates multiple bearing surfaces to ensure superior suppressor alignment. Blind pilot holes at the 3 o’ clock and 9 o’clock positions enable fine-tuning of recoil characteristics for individual shooting styles or ammunition characteristics. Blind pilot holes at the 6 o’clock position enable indexing the adapter at bottom dead center. All that’s required is a basic hand drill and appropriate drill bits.
Compatible with 5.56, 6mm and 7.62 Surefire SOCOM suppressors.


Owen m. (verified owner) –
Surfire said it wouldn’t work. Rooftop said it would. Rooftop was right. Mounted right up to my geissele super h bar and the rc2 clicked right in. 500 rounds down no issue.