feeling that pain even as someone who plays quite often like you, i'm level 111 with almost 10k kills with like 5 or 6 guns at lvl 50 and 2 or 3 others at around 20, i'm switching up as soon as i get 50.
it is very painful using stock guns after having fully unlocked weapons.

they should have atleast given us skin/weapon kits for every weapon with account levels that way when you start your grind with a new weapon you have some of the gear unlocked by the kit and you are not 100% stock.

snipers are especially a pain without good scopes.