The MVA Barrel Level is patterned off of the original Lyman barrel level. The sight will replace the buckhorn rear sight and can be very effective when used with a plain front globe to keep a low sight centerline. The vial is green in color, with a narrow cutout to allow for precise centering of the bubble in the sight. Levels are supplied with an installation tool to help prevent any damage to sight. Dovetail sizes are .378″, .385″, .393″, .440″, .469″, .490″ and .500″. Total height of sight is .295″.