Fab Defense GL-Core AR15/M4 Rifle Stock - Black - The GL-Core is Fab Defense's newest addition to their line of buttstocks. This stock is for Mil-Spec and Commercial Tubes. 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 Made Of Durable And Light-Weight Fiberglass Reinforced Polymer Composite