TacStar's Shotgun Carbon Fiber magazine extension offers an unbeatable strength to weight ratio. It is about four times lighter and stronger than traditional steel tubes. The carbon fiber offers durability and toughness making it the ideal material for an extension tube. The magazine extension also includes a high visibility follower which is machined out of solid aluminum and a barrel magazine clamp. This 8 shot model adds three to the total capacity and compatible with Benelli M2.