MIssion ADaptable (MIAD) modular grip system with interchangeable inserts lets you find the grip configuration that fits your hand size and mission requirements. All models come with main grip body and detachable rubber core in cap for rattle-free internal storage of three spare rounds of .223/5.56 ammo. Additional cores for storing batteries and other items are available separately, below. Front- and backstrap inserts slide on easily, yet snap firmly into place and require no glue or screws to stay put. Basic Kit comes with one straight and two different beavertail backstrap inserts, plus straight and finger-ledge frontstrap inserts