MIL-DTL-48557A, DETAIL SPECIFICATION: MOUNT, TELESCOPE AND QUADRANT - M171A1 (09-SEP-2012) [SUPERSEDING MIL-M-48557]

MIL-DTL-48557A, DETAIL SPECIFICATION: MOUNT, TELESCOPE AND QUADRANT - M171A1 (09-SEP-2012) [SUPERSEDING MIL-M-48557]., This specification covers the Mount, Telescope and Quadrant: M171A1 which supports the Telescope, Panoramic: M137A2 and Quadrant, Fire Control: M17A1 for use on the M777 and M198 series of howitzers. The mount provides adjustments in pitch and compensates for angles of cant when laying the guns for indirect fire.