New Made Item: Ever wonder what the three threaded holes on the rear sight base were for? Well the Army experimented with both scope and night sights but these only made it into the field on a very limited basis. I.M.A has obtained just one of theses scope rails and had it replicated. These accept standard one inch adjustable scope rings. Upgrade your M-1919A4 by adding this Very RARE accessory.  Sorry, but the Bolts pictured are NOT available, nor included.