M4A1-S | Blue Phosphor is the definition of clean minimalism with premium shine. Released in December 2020 as part of The Control Collection, it gives the silenced M4 a uniform, high-end finish. This M4A1-S has been painted in an “Anodized Multicolored” style, with the Blue Phosphor finish: a saturated cobalt hue floods the receiver, handguard, stock, and even the suppressor, while faint crystalline ripples and subtle tonal shifts appear as light moves across the metal. The result is a sleek, almost glassy surface that feels custom-shop perfect right out of the case. In Factory New condition, the coating is immaculate—no scuffs on the can or carry handle, no edge wear on the magwell or rails, and the luminous blue remains uniformly deep and reflective.