FDE’s (Flat Dark Earth) a popular tan/brown finish used on firearms and accessories for low glare, dirt masking aesthetics and durability. Typically applied via anodizing or Cerakote, FDE parts include AR-15/AR-10 receivers, hand guards, stocks, grips, magazines, muzzle devices, and small components. FDE components work with standard AR-15/AR-10 platforms—upper/lower receivers, barrels, BCGs, charging handles, buffer tubes/stocks, rails, and optics—letting builders create color matched or two tone rifles with rugged, corrosion resistant surfaces.