Technical data

TM 9-1005-319-23&P 0015
0015-16
ASSEMBLY - Continued
V E R T I C A L
T A R G E T
L I N E
M 1 6 A 2
1 v s 1 2 0
Figure 21. Alignment of Front and Rear Sights.
NOTE
If barrel assembly (usually new) is not properly aligned in upper receiver assembly
(usually an old part), excessive windage will be present and upper receiver assembly
will require replacement to obtain proper fit between alignment pin and slot.
11. Loosen vise and align bore on a distant vertical target. Center the target in the bore from 12 o'clock
through 6 o'clock. Front sight post should be on line and vertical with the target. Tighten vise. Adjust
rear sight windage until a proper sight picture is obtained on the vertical target. Rear sight aperture
will be approximately in the center of rear sight base if barrel assembly is properly aligned in upper
receiver assembly.