What type of round does the NR-4 appear to be?

The NR-4 is characterized as a HEAT (High-Explosive Anti-Tank) round. HEAT rounds are specifically designed to defeat armored targets, such as tanks and fortified structures. They achieve this through a design that focuses on creating a high-velocity jet of metal upon detonation, which can penetrate armor effectively.

The key features of a HEAT round include a shaped charge that focuses the explosive energy to maximize penetration, making it particularly effective against the armor of military vehicles. This distinct design differentiates it from other types of ammunition.

In contrast, a fragmentation round typically spreads shrapnel upon detonation to inflict damage on personnel and light vehicles, rather than penetrating heavy armor. An armor-piercing round might focus on solid metal cores designed to penetrate targets but may lack the explosive component of HEAT rounds. A high-explosive round would generally be focused on blast effects to destroy a wide area instead of specifically penetrating armor.

Understanding these characteristics highlights why the NR-4 is classified as a HEAT round, making it specialized for engagements against armored threats rather than general explosive or fragmentation uses.