"Critical hits with this weapon create a new ammo in the quiver."
Location
Quick Bow's blueprint only begins to spawn once the player has died two times on a save file - this is because the starting room which contains the blueprint only begins appearing starting with the third run; the first two runs have custom starting rooms which do not have the secret area that appears in the normal starting room. The secret room is located on the left side of the starting room, climb up the wall using the platforms and you will reach a secret tunnel that leads to the blueprint.
Synergies
Due to its high fire rate, Barbed Tips can be used because of the constant arrows from the weapon.