The Spikes Tactical STU5435MLS Complete Upper delivers a high-performance AR-15 upgrade with a 16" 5.56x45mm NATO midlength barrel finished in black phosphate for reliable corrosion resistance and consistent muzzle velocity, paired with a 7075-T6 aluminum black receiver that provides strength without excess weight. This complete upper ships with a 12" SAR3 free-floating handguard that optimizes accuracy by reducing barrel contact and heat transfer, while maintaining a clean, modern profile suitable for precision and field use. The midlength gas system offers a smoother recoil impulse and improved balance, making it a solid choice for both rapid follow-up shots and extended shooting sessions. The barrel is cold hammer forged, delivering enhanced durability and longevity under demanding conditions, and a 1:7 twist rate ensures stable performance with a wide range of 5.56 NATO ammo, from lighter projectiles to heavier projectiles within the caliber. With a thoughtful Black Cerakote-style finish on the barrel and receiver, plus a practical A2 front sight reference, this complete upper is designed to integrate seamlessly with existing AR-15 components, enabling builders and enthusiasts to assemble reliable rifles tailored to duty, competition, or precision training scenarios. Spikes Tactical emphasizes rugged performance and compatibility across standard AR platforms.