To follow up a bit on Waveform's discussion of Cerakote;
It's not hard to work with, but it is not just a degrease and spray it on. You have to do proper prep work on the gun (which from the looks of the GP, Waveform did great prep work, it shows in the final product).
Cerakote is tough stuff. It resists corrosion better than any other coating, even plain stainless steel. If you look at all the pistols that are sold by different manufacturers that are different colors (Flat Dark Earth, OD, Desert Tan, two tone tans, etc) they are Cerakoted right at the factory.
Am I a Cerakote employee? Nope, but I do run a gun repair/refurbishing business (some of my work I have posted here on the Rugers I resurrected) and from my experiences over the years, the only coating I use now is Cerakote because it has shown to be the best.
I do like "pinto" guns, some handguns lend themselves to looking good that way (as in JMHO Waveforms GP does). A lot of people like the contrasting colors,especially on a 1911. I have done many (and have one in the shop now) that the owners want the frame and slide in one color and the small parts (Slide lock, thumb safety, grip safety, hammer, trigger, etc) in a contrasting color. Others want the slide one color and the frame a different color. This one I'm doing now will be Desert Tan with OD small parts. I'll try to remember to take pics and post so you can see what it looks like.