@LaserDisker is a 
Tediore AR.
Can be found in the Elements: Shock, Corrosive
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How to Unlock The Legendary Laser Disker
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Progress through the "Legend of the Stone Demon" DLC until reaching the upper West area of Demon's Domain, where you will carefully jump down to slightly hidden path.
- where you will encounter the pair of Twin Boss "Strumbrang".
Farm Method:
- Defeat Strumbrang.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat "Strumbrang" until @LaserDisker drops.