Armor Piercing Bullets (10) (5e Equipment)
From D&D Wiki
Armor piercing rounds are tipped with a denser metals that traditional bullets, such as tungsten or high-density steel, which in itself is often tipped with a lighter metal "cap" to allow the round to keep its shape upon impact to increase piercing potential. As their name implies, armor piercing rounds are much more effective when used against armored targets, but against softer targets are a waste of resources. A firearm which uses armor piercing bullets gains the armor piercing (-2) property.
Weight: 1 lb.