Arrow Trap

The Arrow trap is a defensive structure that will attack nearby mobs and nonmembers.

Prerequisites: It will shoot at mobs 17 blocks from the chest.
 * Be a member of a Settlement, Hamlet, Village, Town, City, Metropolis, Outpost, or a Base.

Upkeep:
 * Reagents:
 * Arrow * 1
 * Redstone * 4
 * Input:
 * Arrow * 1

It can be built using: Make sure the chest that creates the structure has the top exposed, as this is where the arrow will spawn.
 * Fence * 4
 * Redstone * 4
 * Dispenser * 1