Bukkit

Used to shoot bad guys from a distance (who would have tought O_o).

Crafting:

Now you have to load it with ammo (configurable, gunpowder by default)! Right click with it while holding SHIFT!

Reloading:

Now, you can shoot! Your current ammo will be displayed on a scoreboard (when scoreboards are enabled). Press right mouse button to look through the scope, and then left mouse button to shoot! Note that it must be reloaded after each shot (this is done automatically, reloading progress should be displayed above your health and food bar.