Under-Over is a trait in Destiny 2 that can appear on 28 weapons. There is also an enhanced version with a stronger effect.
What Under-Over does
Deals bonus damage to targets with overshields. Deals a small amount of bonus damage to combatant shields.
Enhanced version
Deals improved bonus damage to targets with overshields. Deals a small amount of bonus damage to combatant shields.
Weapons that can roll Under-Over (28)
Albruna-DArc · Sniper Rifle
Allied DemandKinetic · Sidearm
Bite of the FoxKinetic · Sniper Rifle
Chain of CommandStasis · Machine Gun
Coronach-22Solar · Auto Rifle
Elsie's RifleVoid · Pulse Rifle
Exalted Truth (Adept)Void · Hand Cannon
Horror StoryStasis · Auto Rifle
IKELOS_SR_v1.0.3Solar · Sniper Rifle
Locus LocutusStasis · Sniper Rifle
Marcato-45Strand · Machine Gun
Nameless MidnightKinetic · Scout Rifle
NullifySolar · Pulse Rifle
Nullify (Adept)Solar · Pulse Rifle
OptativeVoid · Hand Cannon
Out of BoundsArc · Submachine Gun
Phyllotactic SpiralArc · Pulse Rifle
Pure PoetryKinetic · Hand Cannon
Randy's Throwing KnifeKinetic · Scout Rifle
Ros Arago IVVoid · Auto Rifle
Scalar PotentialArc · Pulse Rifle
Scatter SignalStrand · Fusion Rifle
Stay FrostyStasis · Pulse Rifle
The Militia's BirthrightKinetic · Grenade Launcher
The Militia's Birthright (Adept)Kinetic · Grenade Launcher
Tripwire CanaryArc · Combat Bow
Unending TempestStasis · Submachine Gun
YesteryearVoid · Pulse Rifle