Yellow border around weapons, does it mean "fully upgraded"?

Yellow border around weapons, does it mean "fully upgraded"? - What If This Is All Real Text With Yellow Background

Some of my items has a yellow border instead of a white one.

It seems to me that this coincides with items where I have gotten all the upgrade slots. Specifically I see that an item where I have opened up all the upgrade slots, but not yet used them, is still white.

Can someone verify that this is what it means, yellow = fully upgraded, or if it means something else, what it means then?






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Yellow border around weapons, does it mean "fully upgraded"? - Top view composition of yellow dry tree leaves arranged around holder with bright yellow pencils on white table





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