The Magpul® MIAD / MOE AA / AAA Battery Grip Storage Core is an easy-to-install internal grip core storage system, compatible with MIAD®, MOE®, MOE+®, MOE-K2®, and MOE® AK grips (not included). Designed to hold two AA or AAA batteries, this self-contained and water-resistant storage core features high-strength polymer construction for superior shock and corrosion resistance, while the precision fit design easily clips in place for optimal stability and dependable, secure storage. A waterproof rubber cap protects the batteries from moisture and corrosion in harsh tactical environments and inclement weather conditions, and the reversible cap design features a "spent" marking on one side to allow you to quickly determine whether the stored batteries are new or spent to avoid any unpleasant low-power surprises. Made in USA.