How To Zero The AR15A4 / M16A2 / M16A4: Dial In The Rear Drum For Distance
This guide details the process of zeroing and utilizing the A2/A4 style rear sight drum on AR-15 and M16 platforms, as demonstrated by Mrgunsngear. It covers understanding the dual apertures, calibrating the elevation drum with an Allen key, and applying sight settings for various distances, including an Improved Battle Sight Zero (IBSZ) method. The instruction emphasizes practical application for accurate shooting from close range to extended distances.













