If you set the sensitivity in-game (meaning MouseSensitivityMultiplierUnit and XFactorAiming in the config file must be set to the default value of 0.02) you should set Mouse Sensitivity Horizontal and Vertical to 5, FOV to 70.53 and Aim Down Sights to 42.
This will not be very accurate though, since the lack of decimals causes a discrepancy of over 8%.
The recommended method is setting the sensitivity in the config file with the following values:
MouseYawSensitivity=5
AimDownSightsMouse=5
MouseSensitivityMultiplierUnit=0.018431
XFactorAiming=0.176822
DefaultFOV=70.53
This is assuming you want to match the scope sensitivity to ACOG. Ironsight will be different.