Bukkit

Additions.yml - here you create your own additions for the guns

Silencer:
    add-texture: 'http://dl.dropbox.com/u/44243469/GunPack/Textures/Silencer.png'
    shot-sound:
        volume: -50
    accuracy:
        spread-angle: '0->0'
ExtraScope:
    add-texture: 'http://dl.dropbox.com/u/44243469/GunPack/Textures/ExtraScope.png'
    zoom-factor: 3
Bayonet:
    add-texture: some url
    melee-damage: 4

These are the nodes, the accepted value types and their function.

NOTE: You can add every string or number node which you can use in guns.yml. The string values will override the old ones if set and the number values will be added to the properties of the gun that adds this addition (negative values will be subtracted)