In the context of firearms, a sling is a type of strap or harness designed to allow a shooter to carry a firearm (usually a long gun such as a rifle, carbine, shotgun, or submachine gun) on his/her person and/or aid in greater hit probability with that firearm. Various types of slings offer their own advantages and disadvantages, and can generally be divided into several categories.
- Simple/Traditional sling (Two-Point)
- The oldest and most familiar design, this sling design has two connection points that attach to the front and rear of the weapon, and allows the shooter to carry the weapon over his/her back, with the sling draped across the torso, around the neck or over one shoulder. Some two-point slings, if properly made, can act as a shooting aid.
- Ching/CW sling
- This type of sling is a component of the Scout Rifle concept, and serves not just as a carrying strap, but as an aid to greater hit probability by helping the shooter aim steadily.
- Two-Point (Quick-Adjust) Sling
- Similar to a two-point simple sling, but with the capability to quickly adjust the length of the sling with a pull-tab.
- Three-point sling
- The advantages of the three-point sling are that it functions more like a harness and is therefore strapped to the shooter. This allows the shooter to release the weapon to use his/her hands for other tasks (such as transitioning to a sidearm) without fear of dropping it on the ground since it will remain hanging from the shooter and easily accessible when needed again. 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.
- Single-point sling
- A specialized sling design that permits the shooter to transition to firing from the opposite shoulder. Like the 3-point sling, the single-point sling permits the shooter to drop the weapon and let it hang downward while still attached to their body. This sling design is best suited for short-term tactical use. A single-point sling is only worn in one way, and cannot provide the same degree of long-term anti-fatigue weight support as other slings. The one great advantage of the single point design is that it is very easy to switch from shoulder to shoulder for weak side barricade shooting. Negative attributes of the single point sling include a tendency to make the rifle dangle and hang off the shooter in an inconvenient fashion; it can interfere with the shooter's movement and hang up on the shooter's gear.
As a shooting aid 
A variation of the single point sling is used in precision target rifle shooting from the prone position. The sling is not intended as a carrying aid, but is used to steady the rifle. For a right-handed shooter, the sling attaches to the top of the left arm, and clips onto the forend of the rifle. The left arm is wrapped under the sling. The sling with upper and lower arm form three sides of a triangle that provide a steady support for the rifle.
- Harllee, William Curry (1912). U. S. Marine Corps Score Book: a Rifleman's Instructor. International Printing Company. pp. 22–30. ISBN 978-1-144-42930-8.
- Petzal, David (2004). "Sling Shot This simple strap can be a hunter's best friend or worst enemy". Field and Stream (Field and Stream) 109 (11): 61.
- Sweeney, Patrick (2005). The Gun Digest Book of the AR 15. Iola, WI: Gun Digest Books. p. 145. ISBN 978-0-87349-947-7.
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