Third person crosshair and first person reticle are not oriented correctly. When firing the launcher at close ranges, the grenade lands far above where you aim, when firing at long distances, the grenade falls short of where you aim, by a lot. For example, if you fire at a target that is 600m away, and aim correctly at the 600m chevron, the grenade lands substantially farther away.
NOTE: The trajectory is correct on the off-road variant, so this issue is specific to the MB 4WD (AT).
On top of that, the SPG-9 sound is very quiet. Either this is a bug, or I am just used to how the RHS mod SPG-9 sounds.