Troy Sling Adapter. $25 shipped CONUS, 1 QD sling swivel included.
Heavy-duty sling adapter slides over collapsible stock buffer tubes to provide secure, ambidextrous attachment for the push-button QD sling swivel. No gunsmithing required—simply tighten down the steel crossbolt with the included hex key wrench. Solid aluminum construction with plenty of extra metal at the stress points to ensure this mount won’t twist, flex, or bend under pressure. Beveled and rounded edges help resist snagging on sling or other gear. Indexes to upper receiver to prevent unwanted rotation of buffer tube. Hardcoat anodized for extra strength and wear resistance; available in matte black or dark earth. Stainless steel swivel has a non-reflective black finish and allows a full 360° of rotation.
Works great for those who don’t want to or are not allowed to remove the RE on their weapon. This has a QD attachment point on both sides and the rotation of the QD sling adapter is limited by the stock and end plate.
http://www.brownells.com/.aspx/pid=27321/avs
