The M855 cartridge, identifiable by its green-painted tip, is a 5.5645mm NATO round designed to enhance penetration against certain targets compared to earlier 5.56 ammunition. This is achieved through a steel penetrator core within the lead projectile. The round’s development aimed to improve performance against light armor and cover.
Adoption of this enhanced ammunition aimed to provide military forces with a more effective option in various combat scenarios. Historical context reveals its introduction followed perceived shortcomings of the original M193 round in penetrating certain materials. While effectiveness remains a subject of ongoing discussion, the change reflects the constant evolution of military technology and the pursuit of increased lethality.