For those who prefer a wider field of view ADCO offers the e-dot 30mm Model. The 30mm format has always been very popular in Europe. It is now enjoying a rise in popularity in the U.S. This option increases your field of view by approximately 20%. Many shooters especially hand gunners like this extra margin.Lens Diam: 1.2 inches. Length: 4.3 inches. Finish: Black (Nickel available). Dot Size: 3 M.O.A. Click Adj: .75 inch. Mounts: Std Rings.