"unlocking" items

[The Starhammer]

Can anyone help me here? I was salvaging some items and some dialogue popped up telling me that I unlocked like a bow shaft and a bow grip (if memory serves). What does this mean? That now I may have the chance that these will appear when I salvage items? Or that they are available for purchase? any help is appreciated. Thanks.

[SoDak]

When a skill or item such as a bow grip or rune is unlocked you are able to use the skill or item on an instant level 20 PvP character (Choosing PvP instead of Role Playing when you create you character).