Hey folks, I'm considering getting a P9 ss with a steel frame but I know next to nothing about how it differs from the normal p9 and PM9 pistols. I'd like to know if there are any differences in the trigger quality, the dependability, or anything else I need to know. I'll be using it mostly for pleasure shooting but it'll see duty as my winter carry weapon so it needs to be dependable. Last, this gun seems to be a lot more expensove than the PM9... why is that? Is it just materials cost or is it a better gun?