You are joking....right?
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VCAS or Savvy Sniper makes some good slings that might fit your needs...
I'm a VTAC user, but have a VCAS too. Probably either one will work for you, I just prefer the VTAC. Padded is more comfy-er.
I don't understand why anything needs to be altered (QD cup or grip panels). Just checked the website and they don't appear to have changed the designs. I use the LaRue QD (OBR) cup and the LaRue plastic grip panels. No modifications were necessary. In the photo the sling cup is at the end, but it was previously mounted closer to the receiver and between the grip panels.
http://i828.photobucket.com/albums/z...ps879adc2e.jpg
ETA: I prefer the padded VTAC sling. Frank Proctor has a sling that does away with the tail but still allows quick adjustments. I will try one eventually.
I don't use slings too much anymore but my favorite was / is the VTAC.
I don't see many mentions on here for the Gear Sector slings, but I have a bunch of their 2 points and like them.