What feature distinguishes lightweight mortars from heavy mortars?

The distinguishing feature of lightweight mortars compared to heavy mortars is primarily based on weight and portability. Lightweight mortars are designed to be more mobile, allowing for easier transportation and deployment by infantry or smaller units. This enhanced portability is crucial for rapid maneuverability in various combat situations, enabling troops to relocate quickly and set up their fire support as needed.

In contrast, heavy mortars are typically larger and heavier, which can limit their mobility and require more personnel or equipment for transportation. This difference in weight and the focus on rapid movement and adaptability in diverse terrains and conditions underscores why portability is the defining characteristic of lightweight mortars.

While caliber size, range and firing rate, and type of ammunition can vary between lightweight and heavy mortars, they do not serve as the primary distinguishing features that emphasize the core advantage of lightweight mortars in operational settings.