Barfing up the file here.
DOWNLOAD.
Umm. It's the finished bow item, you hold up to 25 arrows by default. You drop your arrows on death (someone else can walk by and pick them up). You don't start with any arrows. There are two ammo pickups, an arrow (worth 5 arrows) and a quiver (worth 25 arrows).
Yeah. I think that's it. I included the .blend for the quiver in the .zip file.