I went to the Gun Show recently and I seen some ammo that I was interested in and it was at a good price. I was wanting to know, if any one knows if it safe to shoot Israeli 147 grain +P+ 9mm ammunition in my Rock River Arms 9mm AR15. If it makes any difference, the box was marked Not for Handguns, Machine Gun use only. I would think it would be less pressure than 5.56 ammo but I just wanted to check if anybody has any experience with it first. Thanks for any help you can provide.