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. Two models available one featuring a no snag design that allows the user to navigate rough terrain without interference while the other features aggressive endcuts. - Specifications - 2 1/4 inches long - .864 inches outside diameter - Weighs 2 ounces - For Barrel Thread 5/8-24