The Holosun AEMS CORE X2 enhances the AEMS platform by improving accuracy through an advanced optical system that reduces parallax by 50%. AEMS CORE X2 also features an all-new four post, lower 1/3 co-witness mount. AEMS CORE X2 remains backwards compatible with original AEMS mounts. Up to 50,000 Hours Battery Life Shake Awake Flip Down Protective Lens Covers Lower 1/3 Co-Witness Mount Included