Smooth bore, curved angle firing mortar with a 82mm M69 shell.

Mortar
- 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-3 sight device is used for firing. M74 (M68P1) 82mm fragmentation, smoke screen, and illumination projectile is used to fire from the mortar.

NSB-3 is designed to aim 60 mm M57 and 60 mm M69A mortars.

The NSB-3 is designed for 60mm M57 and 82mm M69A mortars.