This is a TROY Grip known as the Combat Grip, model SGRI-TRG-A0FT-00.
Don't lose your grip when things get dirty. The Troy Modular Combat Grips offer versatility" unmatched durability and outstanding ergonomics in a grip that complements all Picatinny rail systems.
Features:
Flat dark earth finish
Three part modular design
Waterproof high capacity storage compartment
Converts easily into two sizes: 4 5/8 and 3 1/4
