you don't specify what type of rifle?
long or short?
do you want to attach the single point to your rig's d-ring?
since I don't know what your specifics are, get the 1 point bungee sling.
I use the KA version but it's essentially the same but better since it's got a loose end which makes it easier to tighten and loosen. The KA is a complete loop.
OR, wait for the MS2.