Looking at pics of the M1 and it has sling hook ups that would match perfectly with the Blue Force Gear Victory or Vickers slings.
I use to run single points before the Vickers came out. I would not go back.
A modern sling like the VCAS is there to help rather than the old school two points (carry straps) or 3 points (which just get in the way) which just help you carry your firearm around.
The disadvantage to the single point sling is that if you are moving or doing anything other than shooting or standing still, the muzzle (firearm) will swing around like a wrecking ball, which is never good for the knees or nuts. So what happens is if you walk up to change or patch a target, bend over to get more ammo from your pack, pick up empty mags on the ground is that you always have to keep one hand on the firearm.
With the Vickers sling, you don't have to keep one hand on the firearm if you are doing the above things.
With the small loop formed in the Vickers sling, some guys use it to lock their elbow in for longer shots, similar to wrapping the sling but much faster to use.