http://www.talleymanufacturing.com/cgi-bin/public_controller.cgi?view=products&category_recnum=4"The Talley Peep Sight requires appropriate rear base which has to be custom fitted with the peep sight. Own your peep sight for $68.95, which does not include rear base. In most cases, add $12 for extra rear base. We custom fit your peep sight to the rear base at no additional charge."
