I am in need of a sling and have seen some tactical slings that look like they would work but wondered if anyone has used them. I am carrying a mid-weight rifle 12 lbs. I want the rifle to be somewhat hands free for bino work but at the ready for any close encounters, so a cross chest carry would be needed. I also have some crawling and climbing and for this a middle of the back would be the preferred location. Any thoughts? Thanks, edge.