Rock Island Arsenal Meduim weight M14 Barrel

[commosgt]

OK, I only ask here because I cant find this info anywhere. I got tasked with putting together the design for our Brigades Designated Marksman Rifles, I want to go off the M14. My question is what is the twist rate of the Rock Island Arsenal Medium weight M14 barrel? I believe its 1:11 but I dont want to go in front of the 6 with half assed info. I appreciate the help