PTS has produced a compact vertical grip perfectly sized to fit a buffer tube-sized Lithium Polymer battery. This makes it ideal for front-wired guns that have limited space and options for battery placement because of things like rail kits. The top inside of the grip features a groove to run the wires out of and connect to your gun. The bottom hatch latches securely, so there is little risk of your battery or the end cap itself falling off and getting lost. It can fit our standard 7.4 and 11.1v LiPo buffer tube batteries and will attach to any Picatinny or Weaver rail.