This is a Luth-AR Grip known as the Chubby, model PG-01-FDE.
The Chubby Grip(TM) is designed with shooter ergonomics in mind. The full palm swell fills the hand" providing a consistent and rapid grip" properly positioned to promote accurate and repeatable shots on target. The thumb rest and palm shelf work together to lock the hand in place shot after shot" while the raised trigger finger surface" forces the finger into the proper curved position for better trigger control and comfort. Available Right Hand only.
Features:
Flat dark earth finish
Textured for a non-slip grip
A hand fitted and full rounded grip
Palm shelf to help lock-in the grip