Given that you can clampn ACOG to it, common sense dictates it's almost 20mm wide. Probably around 19mm or 3/4".
A 3/8" dovtail rail is (IIRC) what you get on an air rifle and it is WAY smaller than the dovetail rail on the L85.
Sorry, you are right, i was thinking of air rifles when i posted, i also measured my STAR L85 rail and is indeed a 3/4".














