It was all good, i managed to "wrestle" with the trigger and magazine housing and pulled the whole lot free in one piece as suggested. It must have loosened the magazine as it slid out as if nothing was wrong when i tried after.

Just have six screws and the pin holding the sights in place, the six screws ill need to use an impact driver i think as ill end up stripping them otherwise.

I know the pin holding in the sights only comes out one way, does anyone know which way I should force it out from? there doesn't appear to be a visual indication to it.