This is a Hogue Rifle Grip known as the OverMolded Rifle Grip, model 15020.
Hogue's AR/M16 Overmolded Rubber Pistol Grip with Finger Grooves and Beaver Tail is manufactured by merging a durable fiberglass core with the soft comfort of rubber overmolding. Hogue's overmolding process creates a desirable pistol grip that provides the ultimate comfort along with weapon control. Hogue Overmolded pistol grips for the AR-15 platform are specially designed to retain the important lines and aesthetics of the AR and the rubber overmolding works great with either a gloved or bare hand. The overmolding process creates durable comfortable grip that will last you for many years to come.
Features:
Fits AR-15/M-16/AR-10/LR-308 Platforms
Rubber Overmolded Fiber Glass
Beavertail
Finger Grooves
Textured
Non-Slip Grip