At MadBull Airosoft is the Enhanced Pistol Grip for the M16 AEG made by Mission First Tactical... "The MFT EPG16 AEG pistol grip, designed to fit Airsoft M16s/M4s/HK416s, offers a non-slip grip and receiver gap cover to greatly reduce discomfort during sustained usage. It's removable storage compartment allows for most long size motors to fit properly inside.