The SureFire SOCOM556-RC2 is the 5.56 Rifle/Carbine Suppressor optimized for rifles with barrels 10" or longer. This suppressor is the second generation to the USSOCOM selected SOCOM556-RC suppressor. This option is designed to limit visible signature along with having minimal and consistent impact shift (if any) and being under 140dB which is considered to be ear safe. This suppressor is compatible with all 5.56 SureFire SOCOM Suppressor Adapters and attaches with the same Fast-Attach technology as seen throughout the SOCOM Series of suppressors from SureFire. Caliber: 5.56mm (.223 caliber) Weight: 17.0oz (482g) Diameter: 1.5" (3.8cm) Length: 6 Mfg: Surefire