The photos in the thread are of myself and another Marine during a training event quite some time ago. We were experimenting with some variations of sling use to build a more solid tripod shooting position. These techniques have since evolved into using the sling in a more unorthodox way than previously known as the "norm".
The sling should be used as a piece of equipment that allows the shooter to solve problems (IE, compromised shooting positions) and build a solid shooting platform out of just about anything they come across. Granted, and I agree with Lowlight, and this is what we teach; most of these techniques that I teach with slings at my courses are used when the shooter has time to build the positions. Most matches will not allow you the time to use the sling like that, unless of course you train for it. I can get into that sling position shown in the photo in about 2 seconds because I know what my arms, hands, and fingers need to do to make it happen. My brain doesn't outrun my appendages, so I can get it done fairly quickly.
Traditional sling use (NRA stuff) is something I do not teach as a I've gotten to the point of it being a waste of time for field/practical shooting scenarios. Chances are, you're going to have something to shoot off of in a field environment. And if you don't, and you knew you were headed into an environment that has limited items to shoot off of, like grasslands, you didn't properly prepare yourself with a pair of sticks or trekking poles. Kinda your fault...
Slings that have tons of buckles, straps and other whiz-bang adjustments usually take a significant amount of time and effort to adjust for ONE shooting position. Not my cup of tea. At all. A sling needs to be simple and rapidly adjustable for a multitude of scenarios. If not, it's usually going to end up in one of two ways; shit-canned, or left on the rifle to have bad-assery ninja gear status.
Sent from my iPad using Tapatalk