Enjoy improved weapon control and heat management with BLACKHAWK Rail Mount Vertical Grips. Molded of high performance fiberglass-reinforced polymer, these vert grips feature redundant clamp screws for secure, reliable mounting and an adjustable fit to compensate for out-of-spec rails. The grip's O-ring sealed storage compartment is ideal for tools, batteries, or spare parts while the two different caps (included) allow for custom length. Additional features are redundant clamp screws to secure, and O-ring sealed compartment for tools, batteries, etc. It has reliable mounting. Constructed of high-performance fiberglass-reinforced polymer, it improves weapon control and heat management, and is adjustable to accommodate out-of-spec rails.