Further customize your MIAD grip to suit your specific needs with one of these interchangeable internal storage compartments. No tools or permanent alternations required. 123 Battery Core holds two, spare CR123 batteries in a sealed, waterproof compartment, keeping them ready for quick deployment if the batteries in your laser, light, or red dot sight fail. AA/AAA Battery Core provides waterproof, rattle-free storage of two AA batteries or, with the included internal spacer installed, two AAA batteries. Reversible rubber cap has