Sniper's Bracelet
Source: Arcana Unleashed - Deadfall
Weapon (Heavy Crossbow, Light Crossbow, Longbow, Musket, Pistol, or Shortbow), Common (Requires Attunement)
As a Magic action while touching this weapon, you can transform it into a bracelet or back into its weapon form. While in bracelet form, it can’t be used to make attacks.
If the weapon lacks ammunition while in its weapon form, it produces its own, automatically creating one piece of magic ammunition when you make a ranged attack roll with it. The ammunition vanishes the instant after it hits or misses a target.