Daniel Defense URG Complete Upper Receiver, M4A1 FSP RIS II, 5.56 NATO, 14.5", Black/FDE The Daniel Defense M4A1 FSP Upper Receiver Group is built for shooters who want a rifle inspired by the USSOCOM SOPMOD Block II configuration. It pairs a 14.5 inch cold hammer forged M4 profile barrel with a Mil-Spec F-marked front sight base and the M4A1 FSP RIS II rail in Flat Dark Earth. This is part number 23-004-09376. The SureFire SF3P flash hider is pinned and welded to the barrel to bring it past 16 inches, so on a standard stocked lower it builds a rifle, not an SBR. It comes complete with an A1.5 fixed rear sight and the bolt carrier group. A Block II style 14.5 inch upper with a pinned and welded SureFire SF3P and FDE RIS II rail. M4A1 FSP RIS II Rail The M4A1 FSP Rail Interface System II is CNC machined from 6061-T6 aluminum and Type III hard coat anodized in Flat Dark Earth. It is built to fit around the front sight base, giving you picatinny rail on four sides for a light, laser and grip. A rail mounted QD swivel attachment point with a QD swivel is included for your sling. 14.5 Inch M4 Barrel and Front Sight Base Daniel Defense hammer forges its barrels in house from chrome moly vanadium steel. Cold hammer forging packs the steel tight around a mandrel, which gives long barrel life and consistent accuracy. Each barrel is chrome lined, Mil-Spec heavy phosphate coated and HP/MPI tested. The barrel is a 14.5 inch M4 profile with a 1:7 twist. The Mil-Spec F-marked front sight base also serves as the carbine-length gas block. Out front, the SureFire SF3P flash hider and suppressor adapter is machined from heat treated stainless steel with a black Ionbond DLC coating, and it accepts compatible SureFire suppressors. Sights, Receiver and BCG Iron sights are ready out of the box: the F-marked front sight base works with the included A1.5 fixed rear sight, machined from 6061-T6 aluminum. The upper receiver is Mil-Spec with indexing marks and M4 feed ramps, CNC machined from 7075-T6 aluminum and Type III hard coat anodized. The bolt carrier group is M16 profile, Mil-Spec MP tested and chrome lined, with a properly staked gas key. A charging handle is not listed in the Daniel Defense spec for this part number, so confirm one is on hand for your build. Installation and Compatibility This upper receiver group fits any Mil-Spec AR-15 lower receiver. Install it with the two takedown pins, then function check before live fire. The pinned and welded SF3P brings the overall barrel length past 16 inches. Lower receiver, stock, magazine and optics are sold separately. An upper receiver is not the regulated part of an AR-15, so it can ship directly to you where state and local law allow. Browse more Daniel Defense firearms or see AR-15 rifles if you would rather buy a complete gun. Product Specifications Manufacturer: Daniel Defense Model: M4A1 FSP Upper Receiver Group Part Number: 23-004-09376 UPC: 818773021869 Caliber: 5.56mm NATO / .223 Remington Barrel: 14.5 in., cold hammer forged CMV steel, chrome lined, M4 profile Twist Rate: 1:7 Gas System: Carbine length, F-marked front sight base Muzzle Device: SureFire SF3P flash hider / suppressor adapter, pinned and welded Handguard: Daniel Defense M4A1 FSP RIS II, FDE Sights: A1.5 fixed rear sight and front sight base Sling Mount: Rail mounted QD swivel attachment point with QD swivel Finish: Black receiver, Flat Dark Earth rail Weight: 4.58 lb Included: Upper receiver, barrel, RIS II rail, front sight base, A1.5 rear sight, bolt carrier group, QD swivel Lower Receiver: Not included Frequently Asked Questions Is the muzzle device pinned and welded? Yes. The SureFire SF3P is pinned and welded, bringing the barrel past 16 inches. Are sights included? Yes. It has an F-marked front sight base and an A1.5 fixed rear sight. Will it take a SureFire suppressor? The SF3P is a SureFire suppressor adapter, so it accepts compatible SureFire suppressors. Does it include a bolt carrier group? Yes. An M16 profile, MP tested, chrome lined BCG is included. A charging handle is not listed by Daniel Defense for this part number. Is a lower receiver included? No. This is an upper only; it fits any Mil-Spec AR-15 lower. Do I need an FFL to buy it? No. An upper receiver is not a firearm under federal law, but check your state and local laws. Order the Daniel Defense M4A1 FSP Upper Receiver Group from BattleHawk Armory and finish your Block II style build.