It is not a bug as belt feed LMG will have this as a balance issue.
Here is the issue NO SPREAD which is tied to stance and recoil is not tied to stance. So the amount of recoil to balance ADS standing would make ADS bipod also unviable.
Just increasing recoil it is a bad idea when Headshot are made easier by having a bigger head hit box,
This will only be 1 of a few things that will need to change.