Disassembly of an AGM MP40 ???

[ronin677]

Hi all,

I want to rub down the upper receiver on my AGM MP40 and also to replace the hop up rubber at the same time. Does anyone know how to get the inner barrel and hop up unit out of the upper receiver? I've managed to get the barrel off and then took out all the screws I could locate but the inner barrel and hop assembly isn't moving.

any advice would be welcome.

thanks

Jon