FAB Defense GL-CORE CP AR15/M4 Mil-Spec/Commercial Buttstock - Black - The GL-CORE incorporates an integrated cheek weld, ergonomic buttpad and interchanging tube adapters, that provide an unmatched fit on Mil-Spec and Commercial buffer tubes. The CP version includes an additional Cheek Rest, designed to support the use of different optics and holographic sights on the AK and VZ platforms. FEATURES: 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 weld 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 Additional, three positions adjustable Cheek-Rest Made of durable and light-weight fiberglass reinforced polymer composite