So, here we go, another crap suggestion.
My suggestion is like strange items from TF2 the chance would be the same as a legendary, but they wouldn’t be guns, but an attachment so you can put them on all the guns you use the most. Attatchments like “Headshot Kills” “Oneshot Kills” “CXX9010 Kills”.
Ranks aswell (you can just steal those from TF2 like “Hale’s Own” “Harry’s Own”). Or every 50 - 150 kills.
Also add waterworld.