This is a VZ Grips Pistol Grip known as the Palm Swell Tactical, model B92-PTS-BG.
After months of development VZ Grips is pleased with the outcome of their Palm Swell grips. The swell is ergonomically correct and sits perfectly in the palm of your hand. They feel amazing" as if you were part of the gun itself.
Features:
Texture: Aggressive
Frame Size: Full Size