LBE Unlimited AR75RBK Ready Build Kit 5.56 NATO 7.5" CHF Barrel AR-15 Complete Upper

The LBE Unlimited AR75RBK Ready Build Kit is a complete AR-15 upper receiver assembly that bundles the major components needed to finish a compact, short-barreled 5.56 build. At the heart of the kit is a 7.5" Cold Hammer Forged (CHF) barrel chambered in 223 Remington / 5.56 NATO, paired with a pistol-length gas system for reliable cycling in a short-barreled configuration.

The AR75RBK ships ready to drop onto any standard mil-spec lower and includes the complete upper receiver, a standard M16 bolt carrier group, and a classic A2 flash hider. Finished in a clean black and assembled around LBE Unlimited's mil-spec component spec, this ready build kit gives AR builders a single-box solution for putting together a lightweight pistol or registered SBR upper without sourcing each part separately.