Sun Optics 11Mm To Standard. Dovetail Adapter 6In. Long Base is a part of the high quality and dependable Riflescope Mounts and Bases from Sun Optics. All of the features you need for a price you want. Riflescope Mounts and Bases from Sun Optics are well known for their quality and Sun Optics 11Mm To Standard. Dovetail Adapter 6In. Long Base upholds that standard.