Fargo's Mod/Endless Nano Pouch

The Endless Nano Pouch is a Hardmode item that acts as ammunition, and can be placed in the Ammo slots in the player's inventory. While in the user's inventory, it acts as a single Nano Bullet that can be fired from any appropriate Gun without being depleted. Guns with unique shot types will fire their special shots indefinitely. Crafting the Endless Nano Pouch requires 4 full stacks of Nano Bullet (999 each).