I doubt it. It's probably just the generic icon for all of that kind of weapon.
Personally, I think weapon customization, as well as weapon crafting, are both very possible.
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I can see how it's the generic icon, that makes sense. It just caught my eye, looked a little strange.
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Those icons are shaped like the guns they represent...
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I'm talking about the optics.
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Yes. My point is that there likely are not generic icons for different weapon groups, which means that weapon customisation seems likely.