If you kill a person in dm with a weapon, I think that weapon should get a bonus to level it up. About 50 should be right, since you get 5 extra xp for the kill. This would make it possible to level up weapons like floaters, rain, that kinda stuff, since weapon upgrades are very expensive.
Tbh weapons like that are not worth worrying about leveling up, i have them at level 5 and do the same dmg as 4 so...
i know this will never happen, but i would like a level 6 on weps, you can't speed it up and it takes like 20,000 xp to get to. That would be "bragging" rites