Ammunition Weapon Property

You can use a weapon that has the ammunition property to make a ranged attack only if you have ammunition to fire from the weapon. Each time you attack with the weapon, you expend one piece of ammunition. Drawing the ammunition from a quiver, case, or other container is part of the attack [you need a free hand to load a one-handed weapon). At the end of the battle, you can recover half your expended ammunition by taking a minute to search the battlefield.[1]

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If you use a weapon that has the ammunition property to make a melee attack, you treat the weapon as an improvised weapon.[2]

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A sling must be loaded to deal any damage when used normally as an ammo-consuming weapon.[3]

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List of weapon ammunitions, List of weapons requiring ammunition