The Missilaser is a Legendary 
Daedalus Shotgun which is obtainable through the How Rush Saved Mercenary Day Vault Card.
Its unique underbarrel effect fires sticky rockets that can be detonated via the main barrel.
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How to Unlock the Legendary Missilaser Shotgun
Legendary Loot
Weapons
Overview
How To Get
Unlock Location + Farm Method:
- Acquire the How Rush Saved Mercenary Day Bounty Pack (this is free!)
- Complete daily and weekly challenges for Vault Card Tickets
- Daily Challenges provide 3-4 tickets, Weeklies provide 10
- Exchange 10 tickets for a choice of Aching Roil, Extolled Rooker, Missilaser, or Hardpoint!
- You may purchase these guns an unlimited number of times to roll different stats and attachments.
Vex
Incarnate
C4SH
Sleight of Hand
Rafa
APOPHIS Lance