Ade Advanced Optics 2402IR 1-4x24 Multi Coat Rifle Scope with Illuminated Donut Dot Shock-proof scopes need to absorb the heaviest recoil Heavy duty one piece main tube provides the foundation for precise lens alignment and other components Lifetime warranty by Ade Advanced Optics Illuminated Mildot Reticle: Red or Green Has a unique coil spring system