This three piece grip adds some extra functionality to the standard vertical grip design. The core features two ridges that lock securely around the ridge of a Picatinny rail, offering more stability than the single peg found on most vertgrips. The base cap is water resistant and unscrews to reveal housing for a spare pair of CR123a batteries for your weapon lights and other accessories. The body of the grip features checkered texturing for keeping a secure handle on your weapon. This is not a grip solely for airsoft, either; Daniel Defense markets the exact same item along side their real-steel offerings. We're happy for the opportunity to provide an inexpensive, quality grip to our customers.