This AR-15 five-position adjustable foregrip has a Picatinny mounting deck to slide on and screw tight. This AR15 ergonomic grip has finger grooves for the most comfortable holding of your weapon. The end cap conceals an AA or Lithium battery storage compartment, and a twist locks grip mounting. The grips' removable side grip panels allow ambidextrous mounting of the pressure pad. Grips are 5" in length. It mounts quickly to Picatinny or Weaver style rails and quad rails.