Daniel Defense M4A1 FSP Complete Upper Receiver Group - Flat Dark Earth The Daniel Defense M4A1 FSP Upper Receiver Group is a combat-ready, AR-15 style upper built for shooters who demand the performance and configuration of a USSOCOM SOPMOD Block II-inspired platform. Featuring a cold hammer-forged 14.5" M4 profile chrome-lined barrel chambered in 5.56 NATO, a Mil-Spec F-Marked front sight base, and the iconic Daniel Defense M4A1 FSP Rail Interface System (RIS) II quad rail in Flat Dark Earth, this upper delivers accuracy and durability in a proven military-style package. A Surefire SF3P flash hider/suppressor adapter is pinned and welded to the barrel for a legal 16" overall length. The M16 profile bolt carrier group, A1.5 fixed rear sight, and included Rail Mounted QD Swivel Attachment Point round out this comprehensive upper assembly. Product Highlights SOPMOD Block II Inspired Platform: The M4A1 FSP RIS II picatinny quad rail in Flat Dark Earth provides maximum accessory mounting flexibility inspired by elite military configurations. Cold Hammer-Forged Chrome-Lined Barrel: The 14.5" M4 profile barrel is crafted from Chrome Moly Vanadium Steel with a 1:7 twist rate, chrome lining, and Mil-Spec phosphate coating for extended service life and reliable performance. Mil-Spec Bolt Carrier Group: The M16 profile BCG is Mil-Spec MP tested, chrome lined, and features a properly staked gas key for dependable cycling under demanding conditions. Surefire SF3P Muzzle Device: The precision-machined Surefire SF3P flash hider/suppressor adapter features a Black Ionbond DLC coating and is pinned and welded to the barrel, making it suppressor-ready. Complete Ready-to-Shoot Upper: Includes the A1.5 fixed rear sight, charging handle, Rail Mounted QD Swivel Attachment Point with QD swivel, and all mil-spec components for a drop-in upper assembly. Specs Brand: Daniel Defense Model: M4A1 FSP Caliber: 5.56 NATO / .223 Remington Barrel Length: 14.5" (Pinned and Welded to 16" OAL) Overall Length: 16 in Barrel Profile: M4 Barrel Material: 4140 Chrome Moly Vanadium Steel Barrel Finish: Chrome Lined, Mil-Spec Phosphate Coated Barrel Twist Rate: 1:7 Gas System: Carbine Length, Direct Impingement Gas Block: Mil-Spec F-Marked Front Sight Base, .750" Diameter Muzzle Device: Surefire SF3P Flash Hider / Suppressor Adapter, Black Ionbond DLC Coating Muzzle Threads: 1/2x24 Upper Receiver: Mil-Spec, 7075-T6 Aluminum, CNC Machined, Indexing Marks, M4 Feed Ramps Handguard: Daniel Defense M4A1 FSP RIS II Picatinny Quad Rail, 6061-T6 Aluminum, Type III Hard Coat Anodized FDE Handguard Length: 14.5 in Bolt Carrier Group: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key Sights: A1.5 Fixed Rear Sight, 6061-T6 Aluminum, Type III Hard Coat Anodized Finish: Type III Hard Coat Anodized - Flat Dark Earth and Black Weight: 4.58 lb Magazine Included: No UPC: 818773021869 Manufacturer Part Number: 23-004-09376 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. ]]>