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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. Daniel Defense complete upper receiver groups come complete with bolt carrier group and charging handle.Learn More
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The DDM4v1 Upper Receiver Group is built with a Cold Hammer Forged 16” M4 Profile barrel with a Carbine-Length gas system. It comes installed with our proprietary front sight block which is precision CNC machined from a solid billet of 4140 steel. This FSB features a serrated curved design to reduce glare and is salt bath nitride treated minimizing corrosion and wear. Fixed front sights are often regarded to be the most resilient sights and with the DDM4 Rail 12.0™ FSP the operator can still mount a weapon light or aiming device forward of the front sight for optimal ergonomics and a clear line of sight. QD Swivels attachment points are integrated in to the front and back on both sides of the rail for fully ambidextrous sling attachment. Daniel Defense complete upper receiver groups come complete with bolt carrier group and charging handle.Learn More
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Daniel Defense manufactures the highest quality complete AR15 upper receivers on the market today! Every Daniel Defense upper is painstakingly hand assembled, quality assurance tested, and test fired to ensure that the highest quality product makes it to the hands of our customers. The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3″ Cold Hammer Forged Barrel, RIS II MK18 Rail System in Black or Flat Dark Earth, and Daniel Defense low profile gas block.
Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws.Learn More