RE: Gun Sling
there's a good chance you'll be able to brace yourself in the stand, in a way that will offer more stability than the amount a sling could provide. use the sling too, but if the stand doesn't already help support your shot, do like the others said and add a rail or rest of some sort. I use a flexible belt style sling that wraps around my wrist easily, but get more out of using the stand's rail for support.