Thanks for that reminder. I have an old Wingmaster I got to build into an HD gun, and I bought it before learning about the Flextab being a thing. I'm slowly setting it up and plan on just running it without since that's my current option, but once I have it set up as I want it and it's a weird mish-mash of finishes I should send it in to Wilson. It's worth the cost just to refinish the build and get the Flextab kit, never mind whatever else they decide needs replacing.
I'm going to end up with a blued receiver and black-painted barrel, so a refinish is an eventuality. I was thinking I'd eventually track down my own Flextab kit and then get it cerakoated by a local place, but sending it to Wilson for both those things makes more sense.