MiG-23MS & Mig-23BN have same cockpit glass constrution but M|MF|ML|MLD ect ANOTHER type - additional protection.

Original MF & etc glass quickly lose transparency by direct sunlight.

I said again MiG-23MF 15618 DO NOT EXIST.

У МС и БН конструкция фонаря схожая, у М, МФ МЛ итд другая, усиленная.

http://cdn-www.airliners.net/aviatio.../7/1788708.jpg