The PLUG FOR KUNG FU GRIP by DIE FREE CO is the perfect solution for firearm enthusiasts looking to improve their grip and storage capabilities.
 
Product Features:
Storage Capacity: Accepts two CR123, AA, or AAA batteries
Additional Slot: One slot for a single CR2032 battery
Tool Pocket: Space for a small Allen or Torx wrench
MultiTool Compatibility: Slot for a MultiTasker NANO Tool
Grip Extension: Increases grip length by .25" and squares off the back for better palm fit