Holosun AEMS CORE X2 1x 1.1x0.87in Reflex Red Dot Sight Gold 2 MOA Dot Reticle Black AEMS-CORE-X2-GD. 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....