This is a Bravo Company Grip known as the Gunfighter's Grip, model BCM-GFG-MOD-1-FDE.
Bravo Company's BCM Gun Fighter's Mod 1 grip allows for a reduced angle and improved ergonomics when shooting in the modern gun fighting stances. A hinged trap door offers storage inside the grip with a water resistant rubber gasket. Each grip includes both an extended modular insert to close the gap between the trigger guard and pistol grip" and a smooth modular insert for use with some rifles with larger built in trigger guards. (user can decide which one to install). Made in the USA and manufactured from high quality impact resistant polymers.
Features:
Fits AR rifles
Reduced angle for improved ergonomics
Hinged trap door offering storage inside the grip
Test fit to ensure proper function