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Hi Arthur and welcome. The trigger guard is metal/steel. Cheers, stay safe and enjoy!

All Mossbergs, including 590's, have plastic triggers. The sole exception is the "Milspec" M590A1 with its metal trigger, aluminum safety, and heavy barrel. All 500/590 trigger assemblies are compatible within their specific gauge.

Hi Arthur, I just checked mine, and it is polymer. Stay safe & have a great day!