Adept Handling is a Weapon Mod in Destiny 2.
What it does
+10 Handling
Source
Flawless Chest in Trials of Osiris or Grandmaster Nightfalls
More Weapon Mods
Abundant AmmoWeapon Mod
Adept Charge TimeWeapon Mod
Adept Draw TimeWeapon Mod
Adept MagWeapon Mod
BandolierWeapon Mod
Calm Amidst ChaosWeapon Mod
Marksman Optics: HighWeapon Mod
Radar BoosterWeapon Mod
Radar TunerWeapon Mod
ShattershaftsWeapon Mod
Temporal ArmamentsWeapon Mod
Temporal LoaderWeapon Mod
TensionWeapon Mod
Tungsten BowstringWeapon Mod
Unstable ShellsWeapon Mod