Masterwork weapons can be summoned in the Masterwork Weapon summon gate during the Built for War event. Masterwork Weapons are 3, 4 and 5 * weapons which each have a Perk. These Perks can be levelled up with each upgrade of the weapon and the effects of a Perk can stack with similar status effects. The Perks are:
- Rending Ammo
- Incendiary Ammo
- Venom Ammo
- Bullet Resistance
- Health Gain
- Accuracy Bonus