Marble Arms Standard Upright for Marble's Improved T Sight

This is the Standard Upright Stem for the Marble's New Improved Peep Tang Sight Base. This upright stem comes with one aperture, 1/2" .055 diameter hole. The distance for the Standard Range Upright Stem is approximately 200-500 yards. This stem is interchangeable with the Short Range Upright Stem(#Mar990100) with approximate distance of 0-250 yards, Mid Range Upright Stem(#Mar990120) with approximate distance of 450-750 yards and Long Range Upright Stem(#Mar990130) with the approximate distance of 700 1000 yards. (Some guns can not use the Shortest Upright Stem because it does not clear the receiver to the lowest possible upright.) The distances will vary due to the caliber, barrel length, make and model of the rifle.Not for use with standard base, must be mounted on an improved base.