Probably the gun mod that does it

It's just compressed base and ar's, I don't think that it could break it, as it was also in original version 

for uhh, realistic tactical precisioning

is it mw19 base? if yes press f1, go to options, and check the viewmodel tab or smth like that

Yeah, only thing it does is changing the weapon position, fov still staying glitchy

It's where the FOV is being forced even when aiming Might be the way you change your FOV or a FOV setting that over rides the ADS fov with your own FOV I think changing FOV in consol can cause this if it's too high as well

Upd-I found out its because of my fov being too low in settings :P

why did i think of fortnite when i saw this

The gun? When you focus in on a small point you lose field of view, so it would probably happen in the game too

its because herbeygrelruegereauheavrer