The component in question is an ACFT gunnery fire control component.
AGAV
END ITEM IDENTIFICATION
The item identified as "AN/AVQ-26.TARGET DESIGNATOR SET-ELECTRO-OPTICAL,HEAD STRUCTOR" falls under the category of end item identification.
TEXT
GENERAL CHARACTERISTICS ITEM DESCRIPTION
The item consists of several components including a seal (P/N126822), O-rings (C-557-70 AMS 3209), P/N2-127, 2-124, and 2-02, as well as rings (P/NMS16627-1162 and MS16624-75), a thrust race (P/N 930014), a thrust bearing (P/N930013), a pitch shaft assembly (P/N124810), a housing (P/N124818), a bushing (P/N124820), and another thrust race (P/N930015).