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

The SureFire WARCOMP Flash Hider 7.62mm was designed to mitigate flash and greatly reduce muzzle rise so the shooter can keep the weapon on target for faster follow-up shots. Built to withstand the rigors of combat WARCOMP Flash Hider also serves as a solid mounting adapter for any SureFire SOCOM Series 5.56 Fast-Attach sound suppressors.

The WARCOMP 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 muzzle device is individually inspected for concentricity and alignment and is covered by SureFire's No-Hassle Guarantee.

Caliber: 7.62mm
Threads: 5/8x24