Surefire release two types of flash hiders and one of these is the Surefire Warcomp Closed Tine Flash Hider... "SureFire WARCOMP-556-CTN is a closed tine flash hider that is neutrally ported to aid in recoil management. Compared to that of the open tine adapters, the WARCOMP-CTN for 5.56 caliber weapons mimics that of a traditional birdcage flash hider along with being a rock solid mounting option for SOCOM Series Fast-Attach® suppressors.