Gas port size recommendation

Building out a 13.7 that will primarily use M855A1 and MK262. Can anyone give some gas port size recommendations? I’ve downloaded the google drive doc that has a ton of companies gas port sizes in relation to the barrel length. Only problem is that most, if not all 13.7’s are gassed for civilian ammo, for obvious reasons. I know this is a long shot, but does anyone know the gas port size of the KAC KS-1?