Crimson Trace Hardline Pro Black 1-6x24mm 30mm Tube Illuminated Competition Reticle The Crimson Trace Hardline Pro optics are designed with the experienced tactical and target shooter in mind and have been built from the ground up. The line features capped turrets, aluminum 30mm tube, green multi-coated lenses, nitrogen purged, waterproof, shock resistant and ready for whatever elements they encounter.