Looks like the original "lime green" furniture has been superseded by this light Olive Drab color. Probably still not 100% accurate but better than it used to be. Sling in the picture is an EBay-sourced M1 cotton repro.

The sling swivels have a rubberized coating on them. Makes sense to deaden the sound of a metal clip, but I wasn't aware the original 601 had that feature