This item is able to shoot arrows, splash potions, TNT, snowballs. It can store this ammo in its inventory. The ammo is consumed from the player's inventory first, then from Launcher's inventory.
Launcher has 2 shooting modes - rapid and delayed. In delayed mode Launcher shoots with a delay which is equal to creature's damage cooldown . In rapid mode there is no delay.
Launcher can be repaired with iron ingots. You can also add a Penetration enchantment to it using anvil.