Aero Precision AR15 Barreled Upper 16" 5.56 M4 Carbine Barrel w/FSB & M4 Handguard

The Aero Precision AR15 Barreled Upper Assembly with 16" 5.56 M4 Carbine Barrel, Pinned Front Sight Base, and M4 Handguard delivers a proven, modular upper receiver platform for rifle builds, duty weapons, and training systems. This factory-assembled upper combines Aero Precision's reputation for precision manufacturing with a configuration optimized for intermediate-range accuracy and carbine-length gas system reliability.

The 16-inch 5.56 NATO CMV (Chrome Moly Vanadium) barrel with pinned FSB maintains zero without requiring a gas tube, reducing component count and potential failure points in field conditions. Carbine-length gas system tuning ensures consistent bolt velocity across various ammunition types and suppressor use cases. The M4-pattern handguard provides a compact mounting platform familiar to operators accustomed to standard military configurations. The A2 flash hider reduces muzzle signature and blast intensity, critical for indoor range training and low-light deployment scenarios.

This upper assembly serves rifle builders, law enforcement agencies conducting patrol rifle upgrades, military units in need of modular components, and serious shooters constructing precision carbines for 3-gun competition or designated marksman roles. The 16-inch barrel length balances velocity retention with vehicle storage practicality—a critical consideration for law enforcement and security applications. Assembly weight of 3.9 pounds keeps the overall rifle in manageable balance when paired with standard lower receivers and optics.

Aero Precision uppers are manufactured to tight tolerances and undergo quality-control verification before shipment. This upper assembly is compatible with any standard AR15 lower receiver, enabling quick platform reconfiguration for training, duty, or competitive use. Installation requires only a barrel nut wrench and standard armorer's tools—no specialized equipment needed for maintenance or reconfiguration in the field.