i dont think you can add collision groups to instances with a humanoid in it (correct me if i’m wrong) or set collision groups to a model,
but i guess try setting the CollisionGroup for EACH part in the model.
see if that works, then per
i’ve never played with colliongroups before but like i said you can set collisiongroups for every indiviual baseparts if it has a humanoid(i think, try it out if you want) i recommend setting collisiongroups for only parts that have CanCollide turned on.
just read this, might help you out on server and client side
the problem is that when humanoid instance are placed, some parts of the body like the head have CanCollide forced to turn on, so settings the viewmodel’s indiviual base parts COULD be just the solution like @PacaTea is trying to do, but it’s not letting him ._.