The GL-CORE is our newest addition to our line of buttstocks. The integrated cheek rest ergonomic buttpad and an interchanging tube adapter provide an unmatched fit on Mil-Spec and Commercial buffer tubes with a high level of efficiency and comfort. - Advantages: - Ergonomically shaped rubberized butt-pad for quick shouldering and easy maneuvering of the weapon - Interchangeable buffer tube adapters for a tight fit on Mil-Spec and Commercial buffer tubes - Integrated cheek rest in an overall compact and sleek design - No protruding parts will not get caught on gear or webbing - Inversed positioning lever will not open accidently - Two integrated quick detach rear sling swivel connectors - Made of durable and light-weight fiberglass reinforced polymer composite - Available in Matte Black Olive Drab Green or Flat Dark Earth