Arcane Arms Band

The Arms Band functions as a fast acting bag of holding with special properties. It is a band that goes around a character's appendage. The arms band can store 3 weapons inside of it at a time, as a free action once per turn the user can conjure one of these weapons into their hand instantly OR swap it in with a weapon currently equipped. The only limit is that the swap cannot happen between rolling to hit and rolling damage.
As another feature the arms band can channel the user's magic to create ammo for ranged weapons. Also as a free action the user can expend a spell slot to make ammo that lasts for 1 day. The spell slot level corresponds to the ammo summoned:
lvl 1: 10 regular ammo
lvl 2: 20 regular ammo or 5 +1 ammo
lvl 3: 40 regular ammo, 10 +1 ammo, or 3 +2 ammo
lvl 4: 70 regular ammo, 15 +1 ammo, or 6 +2 ammo
lvl 5: 100 regular ammo, 25 +1 ammo, or 10 +2 ammo