The revolutionary SureFire WARCOMP-556-1/2-28 flash hider, which fits M4 / M16 weapons and variants with.5-28 muzzle threads, is the world's most shootable flash hider. Its patent-pending design provides three valuable functions. First of all, it provides over 99% reduction in muzzle flash compared to a plain muzzle, which helps to conceal the shooter's location and preserve his dark-adapted vision. Secondly, it virtually eliminates muzzle rise, which enhances monitoring of target reaction and staying on target for faster follow-up shots. And finally, it serves as a rock-solid mounting adapter for all SureFire SOCOM Series 5.56mm Fast-Attach suppressors, including our SOCOM556-RC model, which placed first in the most extensive and rigorous suppressor testing ever conducted by US Special Operations Command.Specifications and Features: Cartridge: 5.56x45mm NATO Compatible With: AR-15 Country of Origin: United States of America Finish: Matte Material: Steel Threads: 1/2"-28