I received one of the SASS .308's today from CDNN. Barrel is marked win 308, a call to CMMG said using 7.62X51 NATO was OK. Very nice fit and finish. Hopefully I will take it to the range tomorrow for it's first outing. FWIW CDNN also has a MAGPUL MOE equipped CMMG on their site as well that has a 16" SS Full Float barrel. The 2 stage trigger on the one I received has a nice crisp feeling similar to my Rock River 2 stage.