Sorry if the pic is kind of small.
In the screenshot, at the bottom left there is a weapon silhouette. The silhouette shows a medium/long range optic on the weapon, but the weapon in the players hands has a short/medium range holographic optic on it. Could this be a nod towards more weapon customization along with a weapon skill tree? Discuss.
Edit: I'm not talking about the gun, I'm talking about the OPTIC on the gun and the icon being different.
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As far as I know, you can assign attributes to weapons as you level them up. Or the attributes themselves just improve as you level up the gun. As far as full on parts customization, I haven't heard that's something you can do.