Lee Enfield No4 Rifle and No5 Carbine "Singer" Milled Micrometer Sight

A New Old Spares "Singer" rear sight for the Lee Enfield No 4 Rifle and No5 Carbine - fastner kit available seperatley.
 
Rifle sights are calibrated for a longer sight radius and use a unique thread for the elevation screw to achieve 2 MOA increments - scale is marked for the Mk7 British 303 round from 200 to 1300 yards.  
 
Carbine sights are calibrated for a shorter sight radius and use a unique thread for the elevations screw to achiece 2 MOA increments - scale is marked for the Mk7 British 303 round from 200 to 800 yards.
 
The screw mechanism does allow a couple of clicks above this max range and a couple of clicks below the min range for you to set a working 100 yard zero (count whole positive clicks down).
 
Ideal to restore or replace the rear sight on your No4 Rifle - perfect for one made by BSA.