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Remington 870 Magazine +2 Extension Kit

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Increase the capacity of your standard Remington 870 shotgun with our DIY +2 kit. XS Sights extension kit is built to be easily installable, lightweight, and offer additional tactical upgrades to your taste. There are two kit options; the first kit includes our detent tool to quickly hammer out the factory detents, 45" Wolff 12 ga extended spring, and the plus two extension tube. The second includes the 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. 

View Written Installation Instructions.

View article and install by ShootOn



Prop 65 warning WARNING: This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or reproductive harm. (For more information go to

Non-Tritium Products — XS Sights warrants all non-tritium products to be free from defects in material and workmanship. This warranty applies only to the original purchaser. Proof of purchase is required for an RMA. If this product is found to be defective, the manufacturer's only obligation is to replace the product at the manufacturer's discretion, provided that the product has not been damaged through misuse, modifications, neglect, or mishandling. This warranty shall not apply to the finish on any portion of the product or weathering, as this is considered normal wear and tear. Sights improperly installed are not subject to warranty. — XS Sights only warrants products sold through authorized resellers. — All international sales are final and do not qualify for this warranty policy. Some authorized international resellers carry common warranty items to provide for their customers. For more information, please see our International Shipping Policy.

2 Reviews

  • 4
    mag extension

    Posted by andrew schreiber on Mar 31st 2022

    needs barrel clamp & sling stud to fill end hole

  • 4
    Nice all in one package that works

    Posted by Brian B on Oct 25th 2021

    The package came quickly and arrived in perfect shape. The effort needed to really get the detents knocked out took a bit more work and dremeling than I expected. In the end it didn’t add much weight to the shotgun and it functions great so far.