Our OD has always been set to match Cav Arms OD which was matched to Armalite's OD
When we first looked at tan the standard tan was too light and pinkish so we found some material close to a cardboard box and made items out of this called desert tan. After seeing Coyote Brown in real life we decided to move all desert tan products to this color.
Jeff and Eric (from TD and Vltor) did call me up asking if I would like to "buy in" material with them so we would all match but only a small part of items we make use the same material that TD and Vltor use extensivly (Glass Filled Nylon 6).
Also the tan that Vltor and TD use is really "Flat Dark Earth" based upon a milspec color, not the darker Coyote Brown which I first saw released by Cav Arms.
If color coordination is important to you there is always spray paint.
Hey Wes, Got your email and will reply soon. Been a bit swamped here.