The Turner AWS is one of the best slings for competition shooting, but Bushmaster is overcharging, you can get them for $45-50.
look here:
www.creedmoorsports.com/Equip_Sling_Service.htm ARs work best with a 54"/56"
Or you might want to get a web sling from an M1 Garand. You can get them for as little as $5, and are pretty easy to setup:
www.jouster.com/articles30m1/slings.htmMost highpower competitors use some type of mat to lay on during the prone stages of fire. While a purpose built mat is best, you might want to use a blanket or ground cloth while they learn what highpower is all about.
A standard AR isn't the best suited for using a sling in positions, as the tension can bend the barrel. It'll be fine to try out with you rifle, but you should consider getting a "NM" upper with a hidden float tube.
Wear a heavy jacket and a heavy glove, it will make shooting with sling more comfertable.
Come and visit my forum at
www.highpowerforum.com if you'd like to get some more advice about position shooting.