The Colt M4 is a semi-automatic AR-pattern pistol chambered in 5.56x45mm, built on mil-spec forged 7075-T6 aluminum upper and lower receivers with a matte black hard coat anodized finish. It ships with an 11.5-inch chrome-lined barrel and an SBA5 pistol stabilizing brace on a 6-position mil-spec extension, giving it a compact braced pistol configuration. This example is a Shooter's Model, meaning it is new production that carries a small cosmetic finish imperfection from manufacturing rather than a functional issue.