What do the colored bars under the gun symbols represent?

What do the colored bars under the gun symbols represent? - Colorful Artworks

In the "who killed who" listing that scrolls in the bottom left, under the gun symbol there is a bar. I've noticed that it can be different colors. So far I've seen blue, purple, and grey. What does this colored bar mean? I've added a screenshot for reference.

bars






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What do the colored bars under the gun symbols represent? - Colorful Artworks
What do the colored bars under the gun symbols represent? - Glue Gun Beside Green Leaves and Flower on White Surface
What do the colored bars under the gun symbols represent? - Close-up Photo of Water





IPB Military Unit Symbols – Part I




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