It is automatically customized when acquired, and cannot be dropped or traded from one's inventory. Nor can it be salvaged. It can be deleted to make space, however.
You can add a hammer grip to this item.
To acquire this item, once you have either the game of the year/1 million seller edition of Guild Wars or have purchased their availability from the Guild Wars Shop, type /bonus to get all of the special weapons, which are unlocked on your account, spawned into your inventory.