Munition armour was of a standard pattern with interchangeable pieces.

Gradually methods of making steel were perfected and steel replaced iron in most capacities except munition armour.

Munition armour (also "munitions-grade armour", "munition quality armour") refers to any mass-produced armour, historically stockpiled in armouries to equip both foot soldiers and mounted cuirassiers.

Okasi-gusoku - lending or borrowing armour or munition armour, usually made for ashigaru (it might be Tatami-do or any plain basic armour) often marked with clan insignia (mon).

Reduced plate armour, typically consisting of a breastplate, a burgonet, morion or cabasset and gauntlets, however, also became popular among 16th-century mercenaries and there are many references to so-called munition armour being ordered for infantrymen at a fraction of the cost of full plate armour.