Product DescriptionThe LUTH-AR FTBLB20M complete upper receiver assembly is built for shooters seeking a precision-oriented AR-15 upper with a heavy-profile barrel and modern handguard configuration. This assembly features a 20 inch fluted bull barrel chambered in .223 Rem and constructed from 416 stainless steel for strength, consistency, and long-term durability. The A3 flattop upper receiver is paired with a low-profile gas system and a 15 inch Palm Handguard with M-LOK slots and a full-length Picatinny top rail for accessory and optic mounting. It also includes the bolt carrier, charging handle, forward assist, and ejection port cover, making it a ready-to-install upper assembly for compatible AR-15 lower receivers.Product Highlights 20 inch fluted bull barrel in .223 Rem is designed for stability and precision shooting performance. 416 stainless steel barrel with 1:9 right-hand twist helps support durability and reliable projectile stabilization. A3 flattop aluminum receiver with black hardcoat anodized finish offers a strong, optics-ready platform. 15 inch Palm Handguard with M-LOK slots and Picatinny top rail provides versatile mounting space for accessories. Complete upper assembly includes bolt carrier, charging handle, forward assist, and ejection port cover. Specs Brand: LUTH-AR Manufacturer Part Number: FTBLB20M UPC: 812058032014 Product Type: Complete upper receiver assembly Platform: AR-15 Caliber: .223 Rem Barrel Length: 20 in Barrel Profile: Fluted Bull Barrel Material: 416 Stainless Steel Barrel Finish: 416 Stainless Steel Twist Rate: 1:9 RH Thread Pattern: 1/2x28 Receiver Type: A3 Flattop Receiver Material: Aluminum Receiver Finish: Black Hardcoat Anodize Feed Ramp: M4 Feed Ramp Handguard: 15 in Palm Handguard Handguard Interface: M-LOK Rail: Picatinny top rail Gas System: Low-profile gas system Included Components: Bolt carrier, charging handle, forward assist, ejection port cover 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 product&';s manufacturer.