Tdi Arms FFG-4 Folding Vertical Grip 5 Position or FFG-4B (with Battery Compartment)
Low profile short 5 Position Folding Forearm Grip FFG4 for Vertical or Horizontal Steady Grip. Improved performance during rapid fire. Easy to fit & secure.
FFG-4B model with Battery Compartment (holds up to 2 AA batteries)