Ammunition is defined by its various types (standard, gel, APDS, etc.) and by the class of gun (light pistol, heavy pistol, SMG, etc.). For simplicity, each gun can trade ammunition with another gun of its class, though ammunition for firearms and railguns is not exchangeable. For example, all railgun SMGs can share ammo.
The ammunition’s Damage Value and Armor Penetration modifiers are added to the weapon’s base DV and AP. With the exception of regular and armor piercing rounds, none of this ammunition may be used with railguns. Listed costs are per 100 rounds of ammunition.