Description Twilight Light Management System. Constructed of 6061-T6 aircraft quality aluminum with a one inch maintube. Outer lens surfaces are scratch resistant. 100 percent waterproof and fogproof. Windage and elevation adjustable. Aggressively knurled, 1/4-MOA finger click adjustments. Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.