MIL-DTL-12713E, DETAIL SPECIFICATION: QUADRANT, FIRE CONTROL: M1A3 (01-AUG-2012) [SUPERSEDING MIL-Q-12713D].

MIL-DTL-12713E, DETAIL SPECIFICATION: QUADRANT, FIRE CONTROL: M1A3 (01-AUG-2012) [SUPERSEDING MIL-Q-12713D]., This specification covers Fire Control Quadrant: M1A3, used primarily for measuring angles of cant or elevation for various trajectory weapons. This item is commonly referred to as the Gunner’s Quadrant.