so im pretty sure i know the answer to my own question cuz i know everything is bigger on a .308 but i see nothing on any of the slites ive looked on stateing they have .308 sizing just 5.56,m4, ar15. i did find one on brownells that states: Slides over extension and clamps down tight with a unique cross-lock system that adjusts to fit both mil-spec (1.14" O.D.) and larger-diameter commercial (1.16" O.D.) tubes. would this work??? thanks