Increase the capacity of your standard Remington 870 shotgun with their DIY +2 kit. XS Sights extension kit is built to be easily installable" lightweight" and offer additional tactical upgrades to your taste. The kit includes their detent tool to quickly hammer out the factory detents" 45" Wolff 12 ga extended spring" and the plus two extension tube. The one-piece design is machined from 6061 aluminum and hard coat anodized. The aluminum reduces the weight compared to traditional steel tubes. The tip of the extension has wrench flats to allow users to tighten the tube securely. Measuring 6 inches" the extension will not extend past the barrel on a traditional four round capacity shotgun tube. The tube is machined to accept standard barrel clamps to allow for more support and provide the option of a sling attachment point. While built to work with the factory follower" aftermarket upgrades also work. Tested brands of clams and followers include Vang Comp" Nordic Components" and Wilson Combat.