Quoted: I'd be worried if they were using the wrong rear sight bases, the 6/3 is a carry handle thing not an M4 thing.
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According to pages 0011 00-2 and 0011 00-7 of the following manuals it is:
Army TM 9-1005-319-10
Air Force TO. 11W3-5-5-41
Navy SW 370-BU-OPI-010
Operator's Manual For
Rifle, 5.56 MM, M16A2 W/E (1005-01-128-9936) (EIC:4GM)
Rifle, 5.56 MM, M16A3 (1005-01-357-5112)
Rifle 5.56 MM, M16A4 (1005-01-383-2872) (EIC:4F9)
Carbne, 5.56 MM M4 W/E (1005-01-231-0973) (EIC:4FJ)
Carbine, 5.56 MM M4A1 (1005-01-382-0953) (EIC:4GC)
Headquarters, Department of the Army
October 1998
From page 0011 00-2
25 Meter Zeroing Procedure (Cont)
Battlesight Zero
c.:
The 300-meter mark is aligned with the mark on the left side of the receiver. This will read 8/3 for the M16A2/M16A3 and 6/3 for the M4/M4A1/M16A4.
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From page 0011 00-7
25 Meter Zeroing Procedure (Cont)
Battlesight Zeroing Adjustments (Cont)
3.:
Rotate elevation knob in the down direction (counter-clockwise). The elevation knob should stop on the 300-meter mark (8/3) M16A2/M16A3 rifles and (6/3) M16A4/M4/M4A1. The rear sight should be all the way down on the last whole "click" before it bottoms out. This is called mechanical zero elevation for the rear sight. If your range scale will not line up in the above manner, an armor will be required to adjust the range scale for you.
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Edited to correct second quotation from manual.