You can find the Surefire SOCOM Flash Hider 7.62 5/8x24 here.

The SureFire SOCOM Flash Hider 7.62mm has a three-prong flash hider design that greatly reduces muzzle flash, typically greater than 99% compared to a plain muzzle. Built to withstand the rigors of combat, the SOCOM Flash Hider also serves as a solid mounting adapter for any SureFire SOCOM Series 5.56 Fast-Attach sound suppressors. The SOCOM Flash Hider is machined from heat-treated stainless steel bar stock and has high-precision single-point cut threads for optimum thread interface. Finished with a black Ionbond DLC coating to provide maximum protection under harsh conditions and to make cleaning easier. Each SureFire flash hider is individually inspected for concentricity and alignment and is covered by SureFire's No-Hassle Guarantee.

Caliber: 7.62mm
Threads: 5/8x24