This is a Hogue Stock, model 15040.
Hogue's AR-15 Collapsible 6-Position Overmolded Stock uses technology that merges a durable polymer core with the soft comfort of rubber overmolding. This process creates a desirable collapsible stock that provides the ultimate comfort along with weapon control. Hogue Overmolded buttstocks for the AR-15 platform are specially designed to retain the important lines and aesthetics of the AR while provided sleek and durable rubber overmolding. The overmolding process creates durable comfortable stock that will last you for many years to come.
Features:
Hogue Collapsible Carbine Buttstock
Mil-Spec Diameter (1.15 Diameter);Rubber Overmolded Polymer;Textured;Non-Slip Grip