@erichp - You are very observant! And we need to update that picture on our webstore... The picture shows stainless steel roll pins and selector screws. We switched over to alloy steel selector screws last year (or maybe even towards the end of 2015?). They are black oxide coated, same as factory. The roll pin for the trigger is also steel, black oxide and wax coated for corrosion resistance. Again, same as factory.
Not that anything was wrong with stainless hardware, we just had early feedback from customers preferring a factory match on the alloy steel and black oxide finished hardware. So in the spirit of continuous improvement, we switched.