FM 23-9 M16 A1 and A2 Marksmanship July 1989
FM 23-9 M16 A1 and A2 Marksmanship July 1989
Page 3-25, 3-26 M16A2 Standard Sights and Zeroing.
The larger aperture, marked 02 is used for moving target engagement and during limited visibility. The unmarked aperture is used for normal firing...