Instant 3x. There when you need it. Easily flipped aside when you don't. The smart, push-button flip-mount of the VortexA(R) VMX-3T Magnifier is rock-solid, easy to use and can be installed to flip to the left or right. Plus, it locks in place. Images are clear and bright, with excellent edge-to-edge clarity. And the best part? It's a fraction of the cost of similar models! Fully coated optics for optimal light transmission Lightweight, tough machined aluminum construction O-ring seals prevent moisture, dust and debris from penetrating Barrels are filled with nitrogen to inhibit internal fogging Dot centering screws for aligning view of Magnifier with red dot Allows for lower 1/3 or absolute co-witness mounting heights VortexA(R) VIP WarrantyPlease Note: Not recommended for use with prism scopes