Share 'Do I have my bases covered?'

Alright, I got a G&G FS51. (Folding Stock Version) I have upgraded my internals quite a bit. I just want to hear opinions and suggestions. So far I have Dropped in a systema reinforced V2 Gearbox shell and have put a radius in the corners to prevent the gearbox from fracturing. a systema bore-up cylinder kit with a New designed rubber piston head that contures into the cylinder head :D! a M-1…