LBE Unlimited AR145RBK Ready Build Kit 5.56 NATO 14.5" CHF Barrel Complete AR-15 Upper

The LBE Unlimited AR145RBK Ready Build Kit is a turnkey AR-15 complete upper receiver package built around a 14.5" Cold Hammer Forged (CHF) barrel chambered in 5.56x45mm NATO / .223 Remington. The fully assembled upper is ready to drop onto any mil-spec AR-15 lower receiver for an instant, complete carbine build.

At the heart of this build is the 14.5" Cold Hammer Forged barrel. The cold hammer forging process produces an exceptionally smooth and concentric bore, contributing to improved accuracy potential and extended service life under sustained use. The barrel is paired with a mid-length gas system, a popular configuration that helps reduce felt recoil and delivers reliable cycling across a wide range of 5.56 NATO ammunition weights.

The complete upper comes fully assembled with an M16 bolt carrier group and a mil-spec A2 flash hider installed at the muzzle. Whether completing a new carbine build or refreshing an existing platform, the LBE Unlimited Ready Build Kit delivers a straightforward path to a 14.5"-barreled upper in the versatile 5.56 NATO / .223 Remington chambering.