CRIMSON TRACE BRUSHLINE RIFLESCOPE 3-9X40 BDC-RIMFIRE RETICLE The Crimson Trace Brushline optics are designed with the hunter in mind and have been purposefully built from the ground up. The line features aerospace grade 1� tubes that are extremely lightweight as to not add extra weight to hunting rifles. They are fully multi-coated, nitrogen purged, waterproof, and ready for whatever elements they encounter. All Crimson Trace scopes are covered under the LIFETIME protection guaranteed warranty.