What do these bars below my inventory at the Deploy screen in Battlefield 3 mean?

Question

I've noticed that in the Deploy screen of Battlefield 3, there are all these bars below my various weapons and other associated doodads and specialities that fill up the more I use them. What do they indicate? What happens when they fill up all the way?

Answer

The bar represents your progress towards the next unlock in that weapon group. The more you use a certain weapon class, vehicle, etc, the more you points you will earn toward an additional unlock in that category. You can see a more detailed view of this progression in your battlelog profile:

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