This is the same type of sling that would ordinarily cost you $40. You can build it at home for $11. This sling will work well for both rifles and shotguns.
gather all parts needed for the build they are:
7.5 feet of 1.5" wide nylon web
5 inch piece of 1.5" wide nylon web <-------I'm getting feedback that this piece works much better 7 inches long. To each his own, assembly is easier with the longer piece.
Two 15 inch pieces of 1" wide nylon web
Two 1.5" wide buckles
Three 1.5" wide slide locks
Two 1" wide slide locks
Scissors to make the 5" piece and the two 15 inchers
Lighter to seal the ends of the nylon web
All the parts needed to make the sling can be found at ACE hardware for $10.08
Slide a female buckle end onto the 1.5" web and then put a slide lock on the tail of the web itself. Paying attention to the direction of the slide and female end in the picture
Loop the web back and through the slide lock installed in the 2nd step, make your loop 27 inches long. Paying attention to the direction of the slide and female end as before, use the picture if it helps.
Slide a 1.5" slide lock on to the web, note that you will leave an open end of the new slide lock pointing out, this will now be the "outside" of the sling. Follow picture.
Assemble this piece using the 5" long piece of 1.5" wide web and one female and one male end of 1.5" buckles. This step would be hard to describe use the picture for the details, but pay close attention to the way the web is routed and the direction of the buckles.
Slide the assembly you made in step 5 onto the sling as shown in the picture.
Assemble this mess on the open end of the sling using the last male buckle and a slide stop. I left the web loose in this picture to illustrate the way to route the sling through all the parts. Note that the tail of the web is on the outside of the sling, as described in step 4
Tighten step 7 down to look like this, only leave 1/4-1/2 inch of web past the slide lock
Using the two 15" pieces of 1" wide web and the two 1" wide slide locks pass them through like shown in the picture. This is where you will use the open end of the 1.5" lock left over from step 4. The 1" web passes through the outside of the male buckle installed in step 7 and 8
Tighten everything down good, and snap all the buckles, you'll have something that looks like this when your done!
and here it is on an AR using GG&G sling things
Carry in the front, pay attention to how the sling loops over the left shoulder and under the right arm.
Carry on the right side, works well for most applications, can also be modified to sling weapon behind back by just sliding the gun further behind.
Left side carry, excellent for transition drills, when the gun is dropped it will naturally slide to this position clearing the way for holster use on right thigh or hip.
Backpack carry, by splitting the sling straps one for left and one for right shoulder, the weapon can be carried like a backpack for a very comfortable long term carry, a hike for instance, in the sand, carrying a log of fire wood, uphill, both ways
Ready for use, presenting the weapon from the left side carry position, when finished drop gun and it will naturally return to left side carry, smooth!
Transitioning the weapon from right to left shoulder with the sling is as easy as uncoupling the foreward-most buckle. This adds a foot or so to the sling length and makes it possible to shoot left handed while slung for a right handed shooter. Vice Versa for lefty's!