In Lt. Colonel Santose explanation of exceptions to battlesight zero (in TM9-1005-319-10), he states in paragraph 6 line 2 "Small aperture, nose to firing handle weld."
Can someone explain, to this noob, what this means? Do you sight in with the small un-marked aperture or the large, marked 0-2 aperture?

http://grburnett.us/guns/ImprovedBattlesightZero.pdf
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