Smooth bore, curved angle firing mortar with a 120 mm M74 (M75) shell
- used in the open area, trenches, rear slopes, elevations, depressions to eliminate personnel on the ground, open routes through barbed wire and silence the firearms;
- open routes through engineered barriers;
- designed to protect troops from enemy fire and surveillance, create smoke screens, and illuminate the area.
NSB-4 sight device is used for firing.
M62P3 120 mm fragmentation, smoke screen, and illumination projectile is used to fire from the mortar.
NSB-4B is designed to aim 120 mm M74 and M75 mortars.