LBE Unlimited AR125RBK Ready Build Kit 12.5" CHF Barrel AR-15 Complete Upper

The LBE Unlimited AR125RBK Ready Build Kit is a complete AR-15 upper assembly purpose-built for AR pistol and SBR builds. Proudly manufactured in the USA and machined to Mil-Spec standards, this kit pairs a 12.5" Cold Hammer Forged (CHF) barrel with a complete upper receiver and all the supporting components needed to drop onto a mil-spec lower, giving builders a turnkey foundation for a compact tactical rifle.

At the heart of the kit is a 12.5" Cold Hammer Forged barrel chambered in .223 Remington / 5.56x45mm NATO, finished in black and topped with a familiar A2 flash hider. The barrel feeds through a mid-length gas system with a dedicated gas block and gas tube, providing reliable cycling across a wide range of ammunition while keeping felt recoil and component wear to a minimum on a short platform.

Rounding out the upper, LBE includes an M16 bolt carrier group, a free-floating handguard, and the small parts needed to assemble the unit. Every component is held to Mil-Spec tolerances and built to withstand hard use, making the AR125RBK an excellent choice for builders looking to assemble a compact AR pistol or registered SBR.