From Destinypedia, the Destiny wiki
The Hammerhead is a Legendary Machine Gun obtained from the Volundr Forge located in the EDZ. It is the very first Black Armory weapon forged by a Guardian. It is obtained as part of the Black Armoury Machine Gun Frame Quest. It is also the second Machine Gun in Destiny 2 and the first Legendary Machine Gun, the first being the Thunderlord which is exotic.
This weapon has random roll perks, and therefore cannot be re-acquired from collections. The curated roll (God Roll) for this weapon is Hammer-Forged Rifling , High Caliber Rounds, Feeding Frenzy, Rampage.
List of appearances