This is a Hogue Rifle Grip known as the OverMolded Rifle Grip, model 15003.
Hogue's AR-15/M16 Overmolded Rubber Pistol Grip for the AR-15 platform is specially designed to retain the important lines and aesthetics of the AR. Hogue's overmolding process creates a desirable pistol grip that provides the ultimate comfort along with weapon control and is a grip that will last you for many years to come.
Features:
Rubber Overmolded Fiber Glass
No Beavertail
Finger Grooves
Textured
Non-Slip Grip