I have one I took off the FS slide and put on D bruniton slide and bruniton D hammer with a D spring. It is one slick shooter, I was punching one ragged hole with it after 25 rounds at 20 yards.
Upper left is the .40, lower right is a 9mm Brigadier:
The parts aren't 100% plastic, the safety levers and trigger are plastic over metal, the take-down levers, extractor, and trigger bar are in fact carbon steel. They were used in place of SSt because of the increased longevity of carbon over stainless steel.