G&G max imho is way overprice but then again, what isn't from CAS/Buyairsoft?
as regard to OP,
Plastic vs Metal.... the better question should be
what kind of plastic? what kind of metal?
For a fiber reinforced polymer I would take it over a pot-metal (zinc-alloy) metal body.
It's all depending on the material.
Non-reinforced plastic cracks, while pot metal breaks (starting with the fragile parts then progressively worse)
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