I bought a used Black Aces quad rail off eBay, the pictures showed most of the important hardware was included. Turns out I was only missing 2 small 6-32 tapered head screws. BA offers replacement hardware kits, I checked before ordering, but I'm not paying $35 just to replace 2 screws. All I could find locally was zinc plated and stainless, which I opted for because of a slightly larger head. I researched methods of turning SS black, products are available. I bead blasted them Monday before I left work and when I got home put them in some oxpho cold blue, just to try. Not surprised there was no immediate reaction, before going to bed last night I swirled them around and noticed a slight tint. This morning I woke up to black screws! A few spots that didn't get coated (edges/threads) were still white so I rolled them around and they're still soaking. I seriously doubt I'd try this on anything else, but I'm a happy camper that I didn't have to resort to a sharpie.
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