Product DescriptionThe LBE Unlimited Ready Build Kit (AR137RBK) is a compact AR-15 upper build kit designed for shooters who want a durable, performance-focused foundation for a custom build. Centered around a premium 13.7-inch cold hammer forged (CHF) barrel, this kit is engineered for reliability and hard use while keeping overall length ideal for close-quarters and maneuverable setups. The kit includes key upper components such as the upper receiver, barrel assembly, and the gas system parts needed to complete the upper, making it an excellent choice for an AR pistol or short-barreled rifle (SBR) project.Product Highlights Premium 13.7-inch cold hammer forged barrel for long service life and consistent performance Ready-build AR-15 upper kit format provides a strong starting point for a custom upper assembly Includes upper receiver and essential gas system components (gas block and gas tube) Configured for popular .223 Remington / 5.56 NATO chambering (per supplier listing) Black finish for a clean, duty-ready look and easy pairing with most AR buildsSpecs Brand: LBE Unlimited Model: Ready Build Kit Manufacturer Part Number: AR137RBK UPC: 706612408141 Platform Fit: AR-15 Barrel Length: 13.7 in Barrel Type: Cold Hammer-Forged Caliber: 5.56x45mm NATO / .223 Remington (as listed) Color: Black Finish: Melonite (as listed) Approx. Weight: 3.44 lb (as listed) Approx. Package Dimensions: 18.5 in (L) x 3.5 in (W) x 3.5 in (H) (as listed)Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.