LBE Unlimited Ready Build Kit Complete Upper Features The LBE Unlimited Ready Build Kit is centered on a 12.5 inch cold hammer forged barrel a manufacturing process known for producing barrels with excellent durability and long service life under sustained firing. Chambered in 5.56 NATO and compatible with .223 Remington the barrel is paired with a mid-length gas system tuned for reliable cycling in a compact upper configuration. A low profile gas block with the gas tube already installed simplifies assembly removing a step that often slows down a DIY build. The complete AR-15 upper arrives with the dust cover and forward assist already installed saving builders additional time and parts sourcing. An M16 style NiB bolt carrier group is included offering a nickel boron coating that reduces friction and eases cleaning compared to a standard phosphate finish. A standard charging handle and an A2 birdcage flash hider with crush washer round out the kit giving builders a functionally complete upper ready to mate with a stripped lower. This combination of a premium barrel a complete bolt carrier group and finished components makes the kit well suited for AR pistol or SBR builds where a compact close-quarters platform is the goal. The LBE Unlimited Ready Build Kit is for sale at GrabAGun for builders who want a durable precision-machined upper ready for assembly. LBE Unlimited Ready Build Kit Complete Upper Specifications Manufacturer: LBE Unlimited Model: Ready Build Kit Type: Complete Upper Caliber: 5.56 NATO Compatible Hosts: AR-15 Color: Black Barrel Type: Cold Hammer-Forged Barrel Length: 12.5 Barrel Finish: Melonite Gas System: Mid Length Bolt Carrier Group: M16 NiB Muzzle Device: A2 Flash Hider Charging Handle: Standard Available At: GrabAGun