The sling Skadoosh posted may be called a USGI sling, but I have never seen one issued. Of course I only hang out with the military overseas in warzones and have never even been onboard an Army or Marine base in the States. Maybe it is a CONUS thing.
The metal quick detach clip in the pic looks suspect to me, I will stick with something with more positive retention of the weapon.
TFL survivor, THR member, TFL member once again!