Sightmark Citadel 1-6x 24mm Rifle Scope - Illuminated Red CR1 BDC - Be ready to quickly and accurately engage any target with the Sightmark Citadel 1-6x24 Tactical Rifle Scope that has all the features you are looking for in a no nonsense CQB optic. The Citadel offers a Sightmark second focal plane CR1 reticle. The CR1 is a red illuminated BDC reticle specifically calibrated for .223/5.56. It has fully multicoated lenses and robust nitrogen filled construction that make this optic dust proof, fog proof, shock resistant and water resistant. A Sightmark Citadel 1-6x24 CR1 Rifle Scope is the perfect optic for those that are serious about their AR15/M4 platform rifle.