A weapon upgrade kit.

Weapon Upgrades are a collectible item in Singularity. They can be located in various places around Katorga-12, and are used to upgrade Weapons at Weapon Lockers. At least 26 can be found.

Each weapon within a weapon locker has 3 attributes that can be upgraded twice: Damage, Reload Speed and Magazine capacity. The first upgrade of an attribute requires 1 Weapon Upgrade, while the second will require 2. This means it takes 9 Weapon Upgrades to fully upgrade a weapon. Fully upgrading a weapon is also a requirement for the Fully Armed achievement/trophy.