One-Two Punch is a trait in Destiny 2 that can appear on 41 weapons. There is also an enhanced version with a stronger effect.
What One-Two Punch does
Hitting an enemy with every pellet in a shot increases melee damage for a short duration.
Enhanced version
Hitting a target with nearly every pellet in a shot increases melee damage for a short duration.
Weapons that can roll One-Two Punch (41)
A Sudden DeathVoid · Shotgun
A Sudden Death (Adept)Void · Shotgun
Astral HorizonKinetic · Shotgun
Astral Horizon (Adept)Kinetic · Shotgun
Aureus NeutralizerKinetic · Hand Cannon
Basso OstinatoVoid · Shotgun
Dead WeightArc · Shotgun
DeadlockStasis · Shotgun
Deadpan DeliveryArc · Shotgun
Emperor's CourtesyArc · Shotgun
Felwinter's LieSolar · Shotgun
Found VerdictArc · Shotgun
Found Verdict (Timelost)Arc · Shotgun
Hand in HandArc · Shotgun
IKELOS_SG_v1.0.3Solar · Shotgun
IRONWOOD 03Void · Hand Cannon
Last Man StandingSolar · Shotgun
Matador 64Arc · Shotgun
MIDA Macro-ToolArc · Shotgun
Mindbender's AmbitionSolar · Shotgun
Mindbender's Ambition (Adept)Solar · Shotgun
One Small StepKinetic · Shotgun
Perfect ParadoxKinetic · Shotgun
Phoneutria FeraSolar · Hand Cannon
PrecipialVoid · Shotgun
Prophet of DoomArc · Shotgun
PythonVoid · Shotgun
Ragnhild-DKinetic · Shotgun
Retold TaleVoid · Shotgun
Sarpedon-DArc · Hand Cannon
Seventh Seraph CQC-12Solar · Shotgun
SomedayKinetic · Shotgun
Starscape NullSolar · Shotgun
SwordbreakerStrand · Shotgun
Swordbreaker (Adept)Strand · Shotgun
The DeicideArc · Shotgun
Threat LevelKinetic · Shotgun
Triple LaureateStasis · Hand Cannon
Wastelander M5Kinetic · Shotgun
Without RemorseSolar · Shotgun
Xenoclast IVArc · Shotgun