Scope bases for the Vintage Sniper Class competitor putting together a USMC sniper rifle from a 1903 Springfield. These scope bases are for use with Unertl, Winchester A5 and Lyman 5A type mounts. These will duplicate the popular Unertl O, rear, .230" high and E, front, .470" high blocks. These differ from the O&E mounts (item #SME003) in that they have slightly rounded ends and not squared ends and are of the type installed at Springfield Armory. Case color finish. Comes with 6-48 mounting screws.