Proficiency Camo's for Guns

Personally I would like to see something else achievable with my weapons after level 50, personally I am a M240 lover and have been since bf4, It would be nice that after level 50 I could unlock something to show I am proficient with the gun, whether that be a camo or charm or sticker. It could be set up similar to CoD with the gold and diamond camos back in BO2. Where you get a special camo for each specific gun, as well as a special camo for unlocking all of the special gun camos in a certain class of weapon.

Now I know some of the guns have special camos that you unlock as you earn attachments, but I know that I am not going to be able to distinguish that from other camos in the heat of the moment, if it was a flat color (like bf2042) then I would be able to tell and it would be a cool little feature to show off ones accomplishments.