All Steel reproduction 2.5X M73 scope for Springfield 1903-A4 Sniper Rifle. The tube is 3/4" in diameters. Includes All Steel reproduction 3/4 inch Scope Mount for 1903-A4 Springfield Sniper Rifle. This 3/4" scope mount is for use with the 2.5X M73 scope. This mount allows the shooter to adjust windage externally using the two screws beneath the rear scope ring