The high flexibility and easy handling on one hand and the accuracy of operation on the other hand, have made mortars to be considered as the most worldwide suitable weapon in infantry fighting, particularly in hilly or jungle terrains fields. The 120mm mortar shell is one of mortar bombs produced by Iran Defence Industries and characterized by the special process of production and high quality material for the body, resulting in more effective blast and fragments and higher lethality for the ammunition. It is equipped with AZ111-A2 fuze with 2 positions (delayed and quick impact). Long range: Long range type of 120mm mortar bomb is an improved type of that. The new type has more explosive power and as a result causes much better fragments than the previous type, resulting in a better performance. All these improvements are made without any change to the mortar launchers. Above-surface high explosive 120 mm mortar bombs: In this kind of mortar shell the basic fuze AZ111-A2 is replaced with AZ111-A2/ AS. In case of not using above-surface mechanism it will work as an ordinary 120mm mortar shell, but in case of setting fuze to immediate position and using above-surface mechanism, fragments that impact target will increase 30% more and this means that effectiveness of mortar is increased.