Bullet

Quest Reward for

 * Camp Defense (100 units)
 * Time to Dig (100 units)
 * Firearm (20 units)
 * Pyrophobia (30 units)
 * The Adventurer (30 units)

Sold by

 * Adisa Mostafa
 * Ataro Baatar
 * Chen Zhen
 * Nan Yang

Replicator Script

 * Sold by Adisa Mostafa, Ataro Baatar, Chen Zhen and Nan Yang for 3
 * Given as a reward for the quest Time to Dig and for the side quest Firearm