https://www.pcgamer.com/destiny-2s-gambit-prime-and-the-reckoning-modes-will-soon-be-more-rewarding/

Destiny 2's upcoming 2.2.1 update will increase the drop rate of weapons in The Reckoning, the not-quite-horde mode that pits players against the Taken in a timed PvE event with persistent modifiers. Bungie will also be adding most of the weapons to the Gambit Prime loot pool to make it easier for players to pick up those hard-to-get Season of the Drifter weapons. 

"Most weapons will have a chance to drop at the end of Gambit Prime matches. Your drop chance will also increase in both Gambit Prime and the Reckoning every match you don’t get a weapon to prevent long droughts without a drop," community manager Chris "Cozmo" Shannon wrote. "Eventually, you will be guaranteed a drop. Gnawing Hunger, Just In Case, and Doomsday will remain as exclusive drops in the Reckoning."