Thanks for looking @Lozart
The guy who sold me it still has the box in his loft and will look it out for me. Perhaps the manual might be in it also (fingers crossed)
My son's CYMA CM041 all-metal MP5 has a broken mag release lever and mag retention assy. (that's what I'm calling it anyway)
I bought replacement parts (twice!) which unfortunately don't fit.
The front receiver assy is metal and welded together so it's not possible to fit the new button as...