LBE Unlimited AR-15 Ready Build Kit Complete Upper Features The LBE Unlimited Ready Build Kit is built around a 13.7 cold hammer forged barrel finished in melonite for excellent wear and corrosion resistance under hard use. Chambered in 5.56 NATO the barrel pairs with a mid-length gas system and a low profile gas block with the gas tube already installed simplifying assembly for builders. The upper receiver arrives with the dust cover and forward assist already installed saving time over a stripped upper build. An A2 birdcage flash hider with crush washer caps the barrel for muzzle control and a traditional profile. Inside an M16-style complete bolt carrier group with a NiB coating cycles smoothly and resists corrosion better than standard phosphate finishes extending service life between cleanings. A standard charging handle is included so the upper is ready to drop onto a compatible lower without sourcing additional parts. Precise machining and premium components reflect LBE s focus on dependable AR-15 parts built to maintain and upgrade a rifle for years of service. Ideal for AR pistol or SBR builds seeking a close-quarters capable platform this upper kit is available for sale at GrabAGun. LBE Unlimited AR-15 Ready Build Kit Complete Upper Specifications Manufacturer: LBE Unlimited Model: Ready Build Kit Caliber: 5.56 Barrel Length: 13.7 Barrel Description: Cold Hammer Forged Finish: Melonite Color: Black Compatible Hosts: AR-15 Available At: GrabAGun