The Colt AR-15 A4 tactical rifle with full MagPul Flat Dark Earth furniture, represents one of the most successful weapon platforms in history. The AR design has successfully served as a military, law enforcement, defensive, hunting, competition and target rifle in more calibers and configurations than one can possibly conceive. This legendary Colt rifle operates off its traditional gas impingement system. The Magpul MOE rifle stock provides solid cheek weld and a stable shooting platform, while the rifle length Magpul MOE handguard provides steady handling and accessory mounting options. The Colt AR-15 A4 has an ergonomic design making the charging handle, safety selector, magazine release and bolt catch easy to access. The bolt has been magnetic particle inspected, shot peened and pressure tested to ensure that it's structurally sound and will not fail. The 20" 4150 chrome moly steel barrel is chrome lined to make it less susceptible to fouling, reduce corrosion, enhance feeding and to increase barrel life. The Colt AR-15 A4 is chambered for 5.56 NATO cartridges, which allows you to safely fire either full power 5.56 or .223 rounds interchangeably. Both upper and lower receivers are forged from durable, lightweight aircraft grade 7075-T6 aluminum. The surfaces are then hard coat anodized and dry film lubed per military spec to provide wear and corrosion resistance. The durability and reliability of Colt, packaged together with the innovation, adaptability, and customizability of Magpul, presents a uniquely efficient rifle that can handle any task thrown its way.