Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit Black. These specialized adapters are for certain law enforcement applications or competition. High tube adapters allow proper cheek weld and eye alignment with popular optics such as an ACOG or Leupold CQT and others. High-tube adapters and complete stock kits include an optional 9 1/2 in inch top Picatinny optics rail. The heart of the Mesa Tactical Telescoping Stock Conversion Kit is the stock adapter. This part is investment cast and machined A-356 T6 aluminum and replaces the factory stock. The rear and lower faces of the stock adapter resemble the back of an AR-15 lower receiver so it can accept most stocks and grips made for the AR-15. The High-tube Adapters mimic the geometry of an AR-15 rifle which means they can accept any buttstock or grip made for the AR-15. This also means the stock elevation is too high to use receiver- or barrel-mounted sighting systems. This is why High-tube adapter kits usually include a Picatinny scope rail so that an optical sighting system can be mounted on the weapon. The concept is simple: the shotgun stock is replaced by an adapter that mimics the stock attachment point of an AR-15 lower receiver. This adapter accepts an AR-15 mil-spec receiver buffer tube. The AR-15 collapsible stock and pistol grip can then be reliably attached to the shotgun. Equipped with the Mesa Tactical stock adapter the shotguns have an adjustable length-of-pull to perfectly fit to the shooters stature or equipment such as body armor; feature handling characteristics similar to the ubiquitous AR-15; are more compact for transport and storage; and are more controllable due to the pistol grip configuration. No gunsmithing is required to install. Minor fitting of fasteners may be necessary. Specifications for Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit: Manufacturer: Mesa Tactical Color: Black Gun Make: Remington Gun Model: Remington Model 870 Gun Type: Shotgun Fabric/Material: Aluminum Gauge: 12 Features of Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit Lifetime warranty Package Contents: Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit Picatinny Rail What firearm models does the manufacturer say Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit is compatible with? The manufacturer says that Mesa Tactical Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit is compatible with Remington Model 870Mesa Tactical 90630: Remington Model 870 High-Tube Tele Stock Adapter and Rail Kit Black