Uruz6

Hey guys I have a WE m9, the one that came out last year and has the ability to shoot full auto The tip of the loading nozzle has broken of so i need to replace one. I purchased a replacement loading nozzle, but i have no idea how to change it. the old version m9 has a screw at the end of the blow back unit which allows you to take of the metal plate and the two spring attached to it. with the new m9 i don't see a similar screw at all. can anyone please give me some tips?