Lyman™ TacStar Carbon Fiber Magazine Extension Tube Benelli Remington 7 shot - 1081503 offers an unbeatable strength to weight ratio. These extensions are about 4 times lighter than traditional steel tubes, however they are much stronger. The carbon fiber offers durability and toughness to go along with light weight, making it the perfect material for extension tubes. In addition, we also include a high visibility follower which is machined out of solid aluminum and is designed to improve feeding; as well as a barrel magazine clamp.