The Magpul Mission Adaptable Grip(MIAD) is a drop in replacement for the pistol grip on the M16/M4/Ar15 series of rifles.

It features removable and replaceable front and rear panels for a custom fit over multiple hand sizes.
Grip features improved ergonimics and positive rough texture on both sides and rear backstraps
Features a removable inner core that allows for storage (3 round plug included) Custom storage of batteries (waterproof) or bolt/firing pin is available with optional cores.
Full Kit includes 3 size backstraps (s,m,l), 4 frontstraps including integrated enhanced trigger guard, 3 round core plug, installation