JoJo
Everybody is spot on...get a Magpul that is a single/two point sling. It works properly as both. Once you do you will find tha single points are great when actively shooting but are not great shen you want a sling your gun for carry. Also they dont help when stabilizing your gun for precise/longer shots. When carrying your rifle for any extended period to will thruly thank the fact that you can go to a two point.
I havnt used a single point in quite a long time. I prefer a two point that is quickly adjustable. I use Blue Force Gear VCAS (Vickers) slings. They dont adversely effect me in close quarters situations or around vehicles and they give me extra stability in intermediate range.
I am not telling you to go 2-point just because I do. The Magpul sling will give you the ability to do both so you can figure out what system you prefer.