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It is aluminum alloy just like the receiver

It's metal, aluminum.

Omar, It is the 590A1 that has the Metal Trigger Guard. Otherwise it is plastic. --------- The 590A1 has a heavier barrel, metal safety, metal trigger group and bayonet lug. The 590 has a regular barrel, composite safety and trigger group and no bayonet lug. ------- https://www.reddit.com/r/mossberg/comments/a5nmno/metal_trigger_group_for_590/