Technical data

TM 9-1005-319-23&P 0010
0010-4
REPAIR OR REPLACEMENT
1. Check sight parts for serviceability. Visually inspect sight base for cracks, corrosion, or damage.
Check for legibility of markings. Detent indexing surfaces should be well formed. Replace if defective.
2. Visually inspect frame assembly for cracks, corrosion, or damage. Sight aperture should be round.
Flip-up sight arm must lock down. Replace if defective.
3. Check sight cam for function, corrosion, or damage. Replace if defective.
4. Visually check locking bar for damage. Replace if defective.
END OF TASK
ASSEMBLY
WARNING
To avoid injury to eyes, use care when installing spring-loaded parts.
NOTE
The external retaining ring must be replaced if removed for repair of the sight cam.
1. If removed, install sight cam (11) into sight base (17). Push ball bearing (15) and index spring (14) into
hole in sight cam and slide sight cam all the way into sight base. Fasten in place with new external
retaining ring (16).
2. Install compression spring (12) and plunger (13) into frame assembly (10). Install frame assembly into
sight base (17). (It may be easier to rotate sight cam (11) to the 200-meter mark to slide frame
assembly into position and then rotate to the 600-meter mark to hold frame assembly while inserting
windage screw.)
3. Install windage screw (9) into sight base (17).
4. Install index spring (7) and ball bearing (8) into hole in windage knob (6). Align hole in windage knob
with hole in windage screw (9) and fasten in place with spring pin (5).
END OF TASK
LUBRICATION
1. Lubricate BUIS with overall light coat of CLP (WP 0045, item 9).
2. Rotate sight cam to 600-meter mark. Apply 2 or 3 drops of CLP to index spring and ball bearing
through hole in bottom of sight cam.
3. Apply 2 or 3 drops of CLP to plunger and compression spring beneath flip-up aperture sight.