This photo, which is purported to be real, shows a Ranger using the 7.62x51mm FN SCAR-H ( MK 17 Mod 0 ).
The semi-automatic civilian model is called the FN SCAR 17S and will be on sale early next year.
Thanks to jdun1911 and SaysUncle for the link.
Hat Tip: AR-15.com