Normally I wouldn't post something like this but I've seen some comments here about how a sling is not useful at a range or for competitions. I just wanted to say how much I disagree with that. The main purpose of a sling is to get a more steady hold on a rifle. That means better accuracy which is great at the range or in certain competitions.
I just know that I can shoot much more accurate when I use my sling as it was intended to be used. No I haven't tried one on my AR yet but I've used them on countless other rifles. They improve accuracy if they are used as they should be. Carrying a rifle is secondary to that purpose and so is holding on to a rifle better in a CQB situation.
How to Use a Rifle Sling - Photos and Instructions