Upgrading cm16 carbine

[Mikeywinkle]

Please forgive and correct me if I'm posting in the wrong place first time using the forum
I have a g&g combat machine cm16 carbine and have upgraded more or less everything internally
I am wondering what the most powerful spring is that I can use with my setup without damaging anything, as well as any tips / advice as to what else I could improve?
Internals:
G&G standard v2 shell
Shs steel bushings
Shs wiring harness, low resistance wires rewired to deans
Shs 14 tooth steel piston
Poisonapple aluminium piston head
Corrected aoe
Asg double o ring aluminium cylinder head with rubber stopper / sorbo
Guarder type 1 cylinder
Shs aluminium and steel bearing spring guide
Shs double o ring aluminium air nossel
Standard g&g gears
Shs high torque motor
Shs nylon fibre tappet plate
Madbull 3in1 hope up
Madbull black python 363mm tbb


Sorry about the size of this post I am after high fps and durability don't use in skirmishes or anything just target practise so not trying to hurt anyone lol


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