High quality components and precise manufacturing make LBE parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on. The LBE Ready Build Kit comes with a 12.5" cold hammer forged melonite finished barrel, an upper with the dust cover and forward assist Installed, a NiB M16 Style Bolt Carrier Group, a mid-length gas tube pinned in a low profile gas block, a standard charge handle, and an A2 Birdcage flash hider with crush washer.