KWA m9 PTP aftermarket parts
 

Particularly I'm looking at stainless steel or silver frames, slides, outer barrels, and controls. Any idea where to get some? I've been scouring the depths of the internet.

Does anyone know if the PTP's parts are backwards compatible at least?

Sorry for the necro post but ur best bet is the KWA website. Those are the only parts available for now.

Its http://store.kwausa.com/m9ptppartslist.aspx