I have seen some that are a thin plate that goes under the grip. I mentioned to a guy at the range and he said they are also available with a mag well. So I cant say for sure they are. As you said they are presumably steel or possible aluminum.
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Concentrated power is not rendered harmless by the good intentions of those who create it.
Milton Freidman
"If you find yourself in a fair fight,,,
Your tactics suck"- Unknown
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