819.1.a. Quick-Draw is present on Gear with Equip abilities.
819.1.b. Cards with Quick-Draw have Reaction inherently.
819.1.c. Quick-Draw allows cards to be played and Attached using Reaction timing.
819.1.d. Quick-Draw is functionally short for "[Reaction]" and "When you play this, attach it to a Unit you control." See rule 716. Attachment for more information.