The Soltam K6 is a 120 mm (4.75 inch) mortar that was developed by Soltam Systems of Israel. It is the long-range version of the Soltam K5 and has replaced older systems, such as the 107-millimetre (4.2 in) M30, in several armies including the United States Army. It is much lighter than the M30, has a greater range, and can sustain a rate of fire of four rounds per minute, while the M30 could sustain only three.
The K6 fires fin-stabilized ammunition from a smoothbore barrel. Unlike its smaller ammunition cousins, the 81 mm and 60 mm mortars, the fin blades of the ammunition fired from the M120 are not canted. Thus, no spin is imparted to the projectile in flight. Although heavy mortars require trucks or tracked mortar carriers to move them, they are still much lighter than field artillery pieces. They outrange light and medium mortars, and their explosive power is much greater. An improved version is known as the K6A3.
High explosive rounds fired by the M120 weigh about 31 lb (14 kg) and can have a lethality radius of 225 ft (69 m).
The 120 mm MN 9 mortar is intended for own / direct artillery fire support of the maneuvering unit (battalion) with a maneuver of movement and fire. The mortar uses instantaneous-strike (proximity lighter option), smoke, lighting and special ammunition.

Maximum range: 7,240 metres (23,750 ft)
Minimum range: 200 metres (660 ft)
Weight: 144.7 kilograms (319 lb) without ammunition
326.1 kilograms (719 lb) when mounted on trailer
Rate of fire: 16 rounds/min first minute, 6 rounds/min sustained;
Elevation operation: 7-10 up to 15-10;
Working in the direction: 360o
Crew: 6
The M120 mortar system consists of the following major components:
M9 baseplate (136 pounds or 62 kilograms)

Ref: Wikipedia; slovenskavojska.si.