1. Anatomic Pistol Grip "RK-3": "RK-3" was created as replacement for standard AK pistol grip. It has anatomic form, made of aluminum and includes two boxes for batteries inside.
2.Tactical Grip "Transformer" : Consists of four parts - basement, two sections and lower cap. Can be placed on ANY weapon, which have RIS/RAS Rails. Can be transformed to the any size - short grip, long grip, or just grip-hook. There is space inside of the middle section, so, you can put something like battery inside.
3.ZenitCo Tactical Grips "RK": They were created for Russian Special Forces and IPSC shooters by Zenitco company. Can be placed at ANY weapon, which has RIS/RAS Rails. Have waterproof container inside of grip. You can place battery, or something like similar in sizes inside.