When you copy a unit which has a gear attached, do you also copy the gear?

No, you do not copy the attached gear.

When you copy a unit, you are only copying the traits of that specific game object (the unit itself). Attached gear are separate game objects that are linked to the unit via the "Attach" action. Because they are separate cards, they are not included in the definition of the unit's "copyable traits."

According to the rules regarding copy effects (Patch Notes - 2026-03-30):

• Copy effects copy the "copyable traits" of a game object, which are its printed or copied traits.
• Nothing "appended or granted" to the object—such as an attached card—is seen by the copy effect.

Therefore, the new copy of the unit will enter the board without any of the gear that was attached to the original unit.