There's really no attachment swivel on the 715, or a way to install one.
However, it can be done.
I purchased the Viking Tactics Single Point sling. As well as the various clips to attach it to a swivel, it has a wrap around 'cuff' (for lack of a better term) that the included hardware attaches.
If you unscrew the bolt holding the stock onto the gun you can then wrap the cuff around the stock tube, punch a hole in the cuff, put the bolt through it and tighten everything down.
Works like a charm....the only problem is that you have a permanent attachment (the sling itself still can detach from the cuff with the d hood. But you either have to set it up for right or left hand carry because, as I mentioned there is no swivel.
Hope you get my drift with this description.