Mesa Tactical has made the ability to install AR-15 adjustable buttstocks and pistol grips to your Remington 870 12 gauge a real possibility to allow for the ultimate in a tactical shotgun configuration! The Mesa Tactical Remington 870 12 Gauge High-tubeA(R) telescoping stock adapter facilitates the use of a collapsing or telescoping stock for your shotgun, in doing so this shortens the length of pull which is especially important for law enforcement or tactical operators. The High-tube adapters require an optics rail due to the comb height, which Mesa Tactical has included with the system. The Mesa Tactical Remington 870 12 Gauge High-tubeA(R) Telescoping Stock Adapter and Rail Kit is Mfg: Mesa Tactical Products