First In, Last Out
From Destinypedia, the Destiny wiki
First In, Last Out is a Legendary Shotgun in Destiny 2. It originally made its first appearance in the base Destiny 2 game as a world drop or earnable via the Gunsmith, Banshee-44. This weapon is also featured in Season of Arrivals, as one of the many returning Year 1 weapons earnable from Umbral Engrams and the Prismatic Recaster.