The only two manufacturers who's products Ive used to any degree are Wilderness Products (Giles sling) and CQB Solutions. Both make excellent 3 point slings of fairly similar design. I think Wilderness' slings would be better for military applications. They use a very heavy grade of webbing that is stiff and will hold up to years of HEAVY field use. The downside is it's stiff, doesnt move with your body as easily and can sometimes dig at you. CBQ's slings are prefect for police or civilian users IMHO. They use a nice grade of webbing, thats more flexible, and molds to you as move more easily. That said, I use both company's products and think they are outstanding.
[b]Wilderness[/b]
[url]http://www.thewilderness.com/Pages/slings_giles1.html#Anchor-THE-47857[/url]
[b]CQB Solutions[/b]
[url]http://www.cqbsolutions.com/slings.htm[/url]