Welcome!
Are the Shield mags Stainless Steel? I believe so. Mine haven't shown any signs of rust in over two years, so it seems like it.
As to the rear sight dot... To me, It's not worth sending it in to the factory just for the sight dots. I don't use paint though... I'd use either Fingernail Polish and make the dots whatever color you want (yellow, red, Alien Green, pearl white, etc).
Find the color you want your rear sights to be, clean out the sockets real well, buy some Fingernail Polish in the color you picked and go for it. If you get a little messy, some **Non Acetone** polish remover will clean up any overage.
This is basically the same as if you wanted to color your engravings.
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