Ade Advanced Optics 6-25x56 35mm Long Range Rifle Scope Mil-dot Bar Side Focus Heavy duty one piece main tube provides the foundation for precise lens alignment and other components Extended-range tactical riflescope with 6-25x magnification and 56mm objective lens Mil-DotBar reticle; precision controls with 140 MOA adjustment The use of water resistant sealants, synthetic grease and secure O-ring seals protect against fogging 35mm tube diameter; includes mounting rings; matte black finish