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The M121 Carrier Mounted Mortar System consists of the M298 Cannon, M9 baseplate (for ground mount mode), M191 bipod, an adaptor kit for mounting in the M1064A3, and the M67 sight unit with an extension assembly. The turntable provides a ninety degree area of fire. The adaptation kit has a breech piece socket, bipod support, travel clamp assembly, step assembly, and brackets to mount the mortar into the M1064A3. The M121 has also been qualified for use in the AMPV mortar carrier.
Both 120mm mortar system configurations use graphic scales, M16 and M19 plotting boards, and firing tables. The system is compatible with the M2 aiming circle, M45 series boresight equipment, M14 aiming posts, and the M58/59 aiming post lights. The M95/M96 Mortar Fire Control System is currently being fielded which vastly improves all fire control aspects of the system.
The M120A1 Towed System consists of the following components: M298 Cannon (tube), M191 bipod, M9A1 baseplate, and the M67 sight unit. The M120A1, when transported on the M326 Mortar Stowage Kit, is primarily towed by a High Mobility Multi-Wheeled Vehicle (HMMMV).
The M120A1 mortar system configuration uses graphic scales, M16 and M19 plotting boards, and firing tables. Ballistic calculations are accomplished with the M150/M151 Mortar Fire Control System-Dismounted or M32 Lightweight Handheld Mortar Ballistic Computer. The system is compatible with the M2 aiming circle, M45 series boresight equipment, M14 aiming posts, and the M58/59 aiming post lights. The M150/M151 Mortar Fire Control System-Dismounted is currently being fielded which will enable digital coordination of multiple systems and fire support networks, significantly reducing the time required to emplace, fire and displace the weapon.
The M326 Mortar Stowage Kit (or Quick Stow) is a powered device that allows a 120mm mortar to be carried as single unit. The device uses a mortar support strut to hold the mortar tube, base plate and bipod solidly together. This assembly is emplaced or recovered by a hydraulic driven winch. A manual lift winch and strap are also available for use as a manual backup. Once the 120mm mortar is emplaced, the support strut is disengaged and the hauling platform is moved before mortar firing begins.