The Magpul Grip Core MIAD/MOE Bolt & Firing Pin Core is the internal core unit for the Magpul MIAD, MOE, MOE AK and MOE-K2 Grips. The core was designed to hold one (1) included 1/2 oz reusable lubrication bottle. Comes standard with the MIAD GEN 1.1 Grip. Not compatible with the original modular MIAD grip. Made in the USA.