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Most likely a polymer.
The GR line looks FM,
as for the P90, WA200 and K98, looks as those it has plastic furniture.
One downfall of G&G is that they are made affordable, so some aspects get less attention than others..
But I am sure someone knows more about G&G than I do and could possibly give you a real answer :P
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"Weakness of attitude becomes weakness of character."
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