When you complete the following tasks the corresponding weapon will become available for purchase. These weapons cannot be customized.

AMR (Sniper Rifle):
Find 20 relics.

Bull (Shotgun):
Find 10 relics.

Bushman (Assault Rifle):
Activate ALL radio towers.

Japanese Tanto (Replaces Melee Weapon):
Find 6 Letters of the Lost.

Ripper (Light Machine Gun):
Survive 6 Trials of the Rakyat.

Shadow (Pistol):
Take over 17 encampments.

Shredder (Sub-Machine Gun):
Collect 10 memory cards.