The KAK Retro Extended Flash Hider design is inspired by the XM-177 Moderator. This extended flash hider will extend a 10.5" barrel to legal non-NFA length when pin and welded. FeaturesCNC machined from bar steelHeat treated for strengthPhosphate coated to protect from corrosion5 flash hiding ports, sealed bottom similar to an A2 flash hiderAdds approximately 5.56" to overall length of barrel when pinned and welded..125" hole pre-drilled for pin and weld