It seems to me like the matte finish of the heavily bead-blasted areas might be easily prone to scratching. For example, look how quickly the matte-finished plunger tube was scratched by the thumb safety in the photos above.
I've since corrected the thumb safety fit, and was able to easily buff the scratches it had created on the polished flats of the frame, but there's no easy way to remove the scratched/worn area from the plunger tube.
Thank you for the explanation. If you don't mind me asking another question (hopefully you may know the answer), what's the best way to add a basepad to the factory magazine?