This Buy-I-Now is for a New Old Stock Redfield Gun Sight Company Redfield JR IER W/ Adjustable Open Sight For Remington Model 600 & 600 350-Magnum Caliber Part # 600010 Blued Steel Base with Factory Adjustable Open Sight with Mounting Screws, Instructions & Box for the Remington 600 Bolt-Action Rifle.  This Base Uses Redfield Standard Front Turn in Ring and Rear Ring Sets Between Windage Adjustable Screws or any other Manufactured Ring that uses Front Twist in Ring and Rear Ring Sets Between Windage Screws. This Vintage Redfield Base Was Made by Redfield Gun Sight Company When it was Still in Denver, Colorado. This is Still Unused in Original Box with Unused Original Mounting Screws, Instructions & Box. Buyer Pays $8.00 Shipping in US & Will Ship Internationally for $30.00, Thank you, Terry