The SureFire WARCOMP Closed Tine Neutral Suppressor Adapter is for 5.56 rifles with 1/2-28 threaded barrels. This adapter is that of a traditional birdcage flash hider along with having neutral porting which reduces muzzle rise when firing, as well as, is a SOCOM Series Suppressor Adapter. This adapter also has wrench flats for ease of installation. Caliber: 5.56mm (.223 caliber) Length: 2.33" Provides solid mounting option for SOCOM Series Suppressors Machined from heat-treated stainless steel Finished in a tough, corrosion resistant coating. Closed Tine, Birdcage style muzzle device Neutral Porting to reduce vertical climb when firi Mfg: Surefire