Gamemode/wep upgrade mechanic

idk how good this would be, or interest in a gamemode such as this. but if you really like a certen weapon, but you don’t like the base stats. you could select one of the stats, then be put in a rank 5 mission of your choice where you are only allowed to use that weapon and nothing else, and if you made it through it would boost that stat up to 80% or whatever the highest is if they change it. now you couldn’t have all stats at 80, but you could make a current godroll if you were to go through 5 times

it would need to force solo, and idk about how hard this would be or how hard it would be to make. but it seems like a way to have endgame type grind where its not time-gated and forces skilled play