I believe the normal forward grip reduces horizontal recoil by 33% whereas the adv. forward grip reduces it by 50%.
IIRC it is the TR Rhino that has the AFG (not sure what the NC one is). The VS equivalent to the Rhino is probably the Polaris, so why AFG on the Ursa? (genuine question - not being snarky). If I'm wrong and it is actually the TMG 50 that has the AFG on TR then apologies - ignore my question.