No fore grip for me just a handstop. Offers more control than a broom stick type grip. Though a vertical fore grip can serve as a handstop as well, and be used to hold the gun more comfortably while at ease. The magpul afg works well, but I have gone away from these to a handstop to make the foreend a slimmer profile. Hand stops work great to locate your hand on the fore end for more consistant grip which will lead to more consistant shooting.
The VTac sling is a great piece of hardware. I perfer 2 point slings, I feel they give you more carry options. A single point pretty much hangs one way, down the center. So for me when I transition to a handgun and let my rifle hang, it hangs between my legs. If you are doing this fast and dont ease your longarm down it will ram right into your nuts. At this point it is also not tight to your body, which makes moving a bit more difficult.
I have also run the Magpul ms2 and ms3. Good slings that offer more options, one point or two. I feel that the ms2 is too thin and starts to dig into to you after extended use. I would recommend the VTac over the Magpul.
George