The Engage tactical pistol grip (EPG16) provides a combination of fit and function unparalleled by the originally supplied M16/AR15/M4/HK416 pistol grip. The finger swells are textured and the grooved backstraps provide a positive grip surface with wet or gloved hands. There is a secure watertight storage compartment with plug retention for one handed storage access. A customization storage sled with quick access tab diminishes all rattle. EPG16 Features and Functions: Designed for M16/M4/AR15/HK416 Tab covers the receiver gaps that cause discomfort during sustained usage and can be easily removed if desired Finger swells and a grooved backstrap provide a non-slip grip Secure watertight storage compartment Plug retention for one handed storage access Customization foam storage block with quick access tab diminishes rattle