Probably a Wilson Rapid-Thread for the Whisper suppressors.
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Duracoat's color lots seem to vary as well. I used to add a bit of multi dark brown to their "Magpul FDE" for a closer match, but I cannot recall the ratio. Brownell's Aluma-Hyde in coyote is quite close to Magpul's coloring and Cerakote's Magpul FDE is damn near perfect.
How do you like the MW SS Gen 2?
Went a different direction with a 16" .300blk. http://i1111.photobucket.com/albums/...-30-12_170.jpg