These are one-point, two-point, and three-point. Most experts agree that one-point slings are tricky to use and generally not as secure as the other systems. The most common style is the two-point sling, and for good reason. The two-point is regarded as the easiest and most effective type of rifle sling.What is a 3 Point AR sling?
Sling (firearms) The design of the three-point sling consists of a loop of material (usually cordura or similar) that loops around the torso, and two straps that go to the front and rear of the weapon. The shooter's body and the front and rear of the weapon are the three points that give this design its name.