From Black Mesa: Wiki

5-bolt Crossbow magazine as seen in Black Mesa.

Overview

Crossbow Bolts are used as the ammunition to the Crossbow, and are not often found throughout the Black Mesa Research Facility. They are found in magazines which contain 5 bolts each.

Gameplay

Crossbow bolts are a very lethal yet uncommon ammunition, and therefore should be used wisely in an encounter with any hostiles.

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