I believe they have about the same. Both my 92FS and M9 came with a polymer mag release, metal polymer covered trigger, polymer lanyard loop/hammer spring retaining piece, and polymer guide rod. The MDS mags have a polymer bottom but that's not neccessarily a bad thing as it does protect the bottoms from abrasion and metal finish wear. The other parts are so so and I still have most of them on both pistols even though I did buy a metal replacement kit. The only thing that had to go in my eyes were the polymer guide rods. I prefer the more rigid steel replacements that Wolff makes and like the added weight it gives to the front of the pistol even though small. Many seem to believe over at the Beretta Forum that the left side safety arm is polymer also, but I have never seen one that wasn't metal yet, but just heavily coated in Bruniton finish to appear like polymer to some. You will see some finish wear on it as time goes on as both mine have at the bottom of the round inside section of the trigger arm were it rubs the frame.