The Crimson Trace Hardline optics are designed with the tactical and target shooter in mind and have been purposefully built from the ground up. The line features aerospace grade 1" and 30mm tubes that are designed to handle abuse. The line offers generous eye relief to get back on target quickly. 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.