Simple logic that we can literally favorite shaders and armor ornaments but still somehow we dont have a way to favorite weapons so they either show up at the front of all the rest of the slot type, or possibly even a section to have your favorites in a single place so you don't have to dig through your vault each and every time hoping to remember when it came out so you can get close to its placement. I know this would personally save me loads of time going thru my nearly full vault especially for when i change between characters, i could just dump my whole inventory and then bam there it all is right there.