So, I failed to make a screenshot, but description:
I have two pistols. 7.62 mm hawker I think.
Both have the exactly same stats, but one has 122/240 durability, while the other has 123/300 durability.
The former is worth more, likely because it has a higher percentage of durability left.
I think that's a bit off. It just feels like it shouldn't be like this.