The BlackhawkA(R) Vertical Foregrip is an easy-to-install vertical grip, designed to deliver improved comfort and control with any rail-equipped AR-15, AK-47, or other MSR platform. Crafted of high-performance, fiberglass-reinforced polymer, this vertical grip incorporates redundant clamp screws for secure, reliable mounting and an adjustable fit to compensate for out-of-spec rails. The O-ring sealed compartment offers ample storage space for tools, batteries, and other bits and bobs, while two replacement caps allow you to change the length of the grip for a custom fit to your hand and improved control while on the move. Compatible with any Picatinny-style rail.