The MIAD/MOE Lube Bottle Core is an internal grip core that holds an (included) 1/2 oz reusable lubrication bottle. Comes standard with the MIAD GEN 1.1 Grip and the Lube Bottle Core also works with the MOE MOE-K2 and MOE AK Grips.*Note- Not compatible with the original modular MIAD grip (MAG050). Made in the USA.