On some of my weapons there's a little blue hologram on the side of them that's shaped like a bullet (I think) does this serve any purpose or is it purely cosmetic?
Mass-effect – What’s with this hologram
mass-effect-3
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Best Answer
It sounds like you're referring to ammo powers. Warp and Disruptor ammo show as purple and blue holograms, while armor piercing and incendiary ammo show as yellow and red, respectively. Also, as Mr. Smooth said, Cryo ammo is light blue.
Even if you don't have an ammo power equipped, squadmates can give the rest of the squad their ammo power at 50% effectiveness, assuming you put points into that skill.