3ds Max: Gun sling rig

MancD

Hopefully this is clear.
I want the strap (bottom of the image) to droop over the side and behind this bolter (pink line). The strap ends (green) need stay fixed to the rings (in yellow)

I've had a look at at skin wrap modifier/using low poly plane to get the desired effect, but it causes horrible stretching of geo.

I also looked at using bones and skin modifier, but I have little knowledge rigging things and it just made the strap deform at sharp angles when used with spline solver.

What is the best way to do this with natural looking results? Mass FX?

poopipe

if it doesn't need to move just use a path deform