Sympathetic Arsenal is a trait in Destiny 2 that can appear on 21 weapons. There is also an enhanced version with a stronger effect.
What Sympathetic Arsenal does
Reloading after a final blow also reloads stowed weapons.
Enhanced version
Reloading a short time after a final blow also reloads stowed weapons.
Weapons that can roll Sympathetic Arsenal (21)
Adverse Possession IXArc · Scout Rifle
Arc LogicArc · Auto Rifle
BlowoutArc · Rocket Launcher
Brass AttacksVoid · Sidearm
Brigand's LawArc · Sidearm
CynosureStrand · Rocket Launcher
Enyo-DKinetic · Submachine Gun
False PromisesKinetic · Auto Rifle
Forensic NightmareStasis · Submachine Gun
Friction FireKinetic · Submachine Gun
Imperial NeedleVoid · Combat Bow
Opaque HourglassArc · Combat Bow
Pleiades CorrectorSolar · Scout Rifle
Stars in ShadowSolar · Pulse Rifle
SublimationArc · Scout Rifle
The KeeningArc · Sidearm
The MountaintopKinetic · Grenade Launcher
The NumberArc · Auto Rifle
The Third AxiomArc · Pulse Rifle
The VisionArc · Sidearm
TrusteeSolar · Scout Rifle