Daniel Defense M4A1 14.5 in Barrel 5.56mm NATO Upper Receiver Group

The Daniel Defense M4A1 Upper Receiver Group features the M4A1 Rail Interface System (RIS II), which has been in use by US Special Operations Command (SOCOM) for the SOPMOD II Weapons System since 2005. This two-piece, free-floating rail system allows the mounting of devices like a M203 grenade launcher without influencing the barrels harmonics, eliminating problems like wandering point of impact that plagued other mounting designs. The two-piece design also allows for partial disassembly of the rail to aid in cleaning around barrel without completely removing the entire rail system. The weight of anything attached to the RISII rail system is fully supported by a sturdy bolt-up system, using 6 grade 8 bolts, leaving the barrel completely free floating for best possible accuracy and dependability. The M4A1 features a 14.5″ Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Improved Flash Suppressor to meet the NFA required 16″ length. All Daniel Defense complete upper receiver groups come standard with an M16 profile bolt carrier group. Specifications for Daniel Defense M4A1 14.5 in Barrel 5.56mm NATO Upper Receiver Group: Manufacturer: Daniel Defense Cartridge: 5.56x45mm NATO Barrel Length: 16 in, 14.5 in Barrel Profile: M4 Gas System Length: Carbine Length Finish: Anodized Color: Black Gun Model: M4 Condition: New Weight: 4.56 lb Magazine Included: No Features of Daniel Defense M4A1 14.5 in Barrel 5.56mm NATO Upper Receiver Group UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 14.5″ M4 Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel and Mil-Spec Heavy Phosphate Coating, Carbine length, Direct Impingement MUZZLE DEVICE: Daniel Defense Extended Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished, pinned and welded to Barrel BOLT CARRIER GROUP: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key HANDGUARD: Daniel Defense M4A1 Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE RAIL PANELS: Daniel Defense Rail Panels Made from Santoprene, Heat Resistant to 300° F. The Daniel Defense M4A1 14.5 in Barrel 5.56mm NATO Upper Receiver Group is a quality addition to the Daniel Defense lineup. For more great deals on AR15 Upper Receivers by Daniel Defense, please browse our Daniel Defense Gun Parts page. Daniel Defense Warranty: Guaranteed Satisfaction All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer’s products. Warranty information and warranties are supplied solely by the manufacturer, and not this retailer. This retailer publishes information from the manufacturer for information purposes only, and the manufacturer is solely responsible and liable for any warranty information and warranties published by this retailer. Please reference the appropriate manufacturer documents or reach out to the manufacturer directly for full warranty terms and effective dates. @media screen and (max-width: 400px) { #w-block-one { display:table-row !important; } }