Daniel Defense M4A1 Complete Upper Receiver 556NATO 14.5 Inch Pinned for AR-15 – Carbine Gas, RIS II Rail (23-004-09376)

• Complete upper receiver chambered in five point five six NATO with fourteen point five inch barrel
• Pinned muzzle device extends overall barrel length to compliant sixteen inch configuration
• Cold hammer forged barrel with one in seven twist supports consistent projectile stabilization
• Includes M16 profile bolt carrier group with properly staked gas key assembly
• Carbine length gas system supports reliable cycling in AR platform rifles
• Features RIS II quad rail handguard for accessory mounting and structural support

The Daniel Defense M4A1 Complete Upper Receiver is a rifle upper receiver assembly designed for use on AR platform firearms.

This Daniel Defense M4A1 Complete Upper Receiver is chambered in 5.56 NATO and .223 Remington and features a 14.5 inch barrel pinned to a 16 inch overall length. It includes a carbine length gas system, a 1:7 twist chrome-lined barrel, and a Picatinny RIS II rail interface system in flat dark earth. This product is used for assembling or replacing the upper portion of an AR rifle in standard configurations. The Daniel Defense M4A1 Complete Upper Receiver includes an M16 profile bolt carrier group, a Surefire SF3P flash hider, and a Mil-Spec 7075-T6 aluminum upper with M4 feed ramps. In practical use, the assembly integrates a fixed front sight base and A1.5 rear sight for consistent sight alignment.