Trijicon Reflex A.R.M.S. 15 Throw Lever Mount Overall length: 4.27 inch Height of mount surface to optical axis: 1.381 inch Color: matte black A.R.M.S. #15 Throw Lever Mount This mount requires the RX125 SPACER or RX23-SPACER (sold separately) when attaching it to an RX30 Model Reflex