This is a Daniel Defense Grip, model 21-071-05177-012.
Daniel Defense's Pistol Grip is designed with ergonomics and controllability in mind. It shares the angle of the classic 1911 pistol for the most natural hand position and comfortable feel. This pistol grip incorporates an oversized trigger guard covering the gap between grip and lower receiver which can wear on the shooters hand and easily accommodates for gloves. Installation is simplified by the fact the integral trigger guard doesn't require a roll pin so there is a reduced chance of damaging the lower receiver. A soft touch overmolding section enhances grip" wet or dry.
Features:
Soft Touch Rubber Overmolding
Ergonomic durable and lightweight;4.25 tall 2 wide and 1.38 thick