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i myself just went through this process. I redid the whole look on my WE 1911. it was all dark gray, and now it has 2 tones of gray, some black, and i polished some parts to a mirror shine. Pics will follow, but thats another story in another thread..
All of this to say that doing what i do in life and in all modesty, i have a very good knowledge of paint and how it should be done if you want a professionnal result. For ANY paint job, i would HIGHLY reccommend getting rid of ALL the old paint first. Yes its long. Yes you have to be meticulous. But its the difference between amateur and professionnal looking.
sand it off with 600 or higher wet-dry sandpaper. that way you dont scratch your metal with a thick grain sandpaper.
The reason why i would take it all of is that first, it ensures a completely clean surface to paint on. gets rids of any scratches in the old paint, etc. Before painting, you have to make sure your surface is extra clean, free from any dust, dirt, oil, etc. Stripping it to the raw metal is the best way to make sure of that. And since you have the option, you don't want to leave a old layer of paint under a new one...
If you wanna go lazier then that, you still have to sand the old paint first to get your paint to adhere better.
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