Yankee Hill Machine Co Phantom Flash Hider Without Teeth, 308 Win, 762NATO, Black, 5/8X24, Fits AR10 style Rifles YHM-3080-5C1 5 Port Phantom design and performance in a .308 format. Includes Crush Washer. This 5 port design has no downward facing port which helps prevent dust problems when shooting in the prone position.