If you have an FN SCAR and you are looking for sling mounting solutions, check out the new SCAR 1913 Accessory Side Rail from Damage Industries. It is a drop in replacement for the original side rail so installation should be easy. It offers 10 slots and a QD sling swivel mounting point.
The SCAR 1913 Accessory Side Rails are hard anodized for durability and are available in black or Flat Dark Earth. Check them out on DamageUSA.com.