I have a few questions on the stainless pt92. Is the slide actually stainless steel or does it have some type of finish? Also is the barrel 100% stainless steel or is it plated. I thought i saw an old 92 that had chrome chipping off the top of the barrel. I know these barrels aren't chrome bored. Also,is there any type of finish on the polished aluminum frame or is it bare. I would think bare aluminum would oxidize .