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Mesa Tactical High-tube® Telescoping Stock Adapter and Rail Kit for Rem 870 (12-GA, 9 in rail)

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  • $ 174.95


Use Mesa Tactical’s collapsible stock kits and adapters to install AR-15 adjustable buttstocks and pistol grips onto the venerable Remington 870 and Mossberg 500/590 shotgun platforms for the ultimate in tactical shotgun configuration performance.

The most important capability of these adapters is to facilitate the use of collapsing or telescoping stocks, which provide a shorter length of pull (LoP) than the factory stock, which is especially important for law enforcement or “tactical” operators. In addition, these stock adapters accept a hydraulic buffer from Crosshair™ that reduces felt recoil. The Mesa Tactical/Crosshair combination is by far the most robust and most effective of several recoil-reducing shotgun stock systems on the market.

There are two lines of Mesa Tactical telescoping stock adapters:

1. High-tube® telescoping stock adapters, that require the use of rail mounted optics;

2. LEO® telescoping stock adapters, which feature a stock elevation about an inch lower than the High-tube adapters and so don’t require sighting or aiming aids.

These adapters are available in two types of kits, adapter kits or complete stock kits.

The heart of the Mesa Tactical Telescoping Stock Conversion Kit is the stock adapter. The stock adapters are investment cast aircraft grade aluminum, CNC machined and powdercoated black with a tough, chemical resistant finish.

Our High-tube adapters have a comb height equivalent to an AR-15 and require an optics rail (included). 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 stock kits include nine inch or 24 inch top Picatinny optics rails. While the 9.50 inch rails can optionally be secured to the shotgun receiver as well as the stock adapter, the 24 inch rails are anchored at the front by a clamp. No gunsmithing is required to install. Minor fitting of fasteners may be necessary.

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 receiver buffer tube. The AR-15 collapsible stock and pistol grip can then be reliably attached to the shotgun. 

Stock kits additionally include an M4 Carbine style telescoping buttstock assembly, a Hogue rubber overmolded pistol grip, a stamped steel stock wrench and a push-button sling swivel. A slip-on rubber butt pad for the M4 Carbine buttstock is available separately.


The Mesa Tactical Telescoping Stock Adapter Shotgun Conversion Kit should include the following components:

  • 1 Cast aluminum and powdercoated telescoping stock adapter
  • 1 Receiver cap screw
  • 1 Receiver screw hex key
  • 1 AR grip screw
  • 1 Cast aluminum and powdercoated telescoping stock adapter
  • 1 Receiver cap screw
  • 1 Receiver screw hex key
  • 1 AR grip screw
  • 1 Picatinny scope rail
  • 2 Picatinny scope rail cap screws
  • 1 Picatinny scope rail cap screw hex key
  • 1 Machined nylon Picatinny scope rail rear spacer
  • 1 Molded nylon Picatinny scope rail forward spacer
  • 2 Aluminum mount point cover plates
  • 4 Mount point cover plate button-head screws
  • 1 Mount point cover plate screw hex key
  • 2 Threaded steel flush cups

Assembly of the Mesa Tactical Telescoping Stock Adapter Shotgun Conversion Kit requires no special tools and should take less than 30 minutes. All required hex keys and an AR-15 stock wrench are included with the stock kit. All you will need to provide is a Phillips head screwdriver (for the pistol grip), plus whatever tools are required to remove the old stock (an AR-15 stock wrench and stock nut is not included with the stock adapter kit, only with the complete stock kit).