Acquire a Pristine Golden Age Ammunition Module from Xûr, the Agent of the Nine.
Bring the frame to the Gunsmith.
Flavor text
The Gunsmith hands back the machine gun. "The weapon is very upset. It grieves for someone named Pahanin, and fears for its own future. I think you'll need to give it another gift."
"Xûr will have what you need."
Delighted to have found a worthy wielder, the weapon AI asks for one last chance to say goodbye to the Gunsmith.