Daniel Defense DD4 RIS II Barreled AR-15 Upper Receiver - 5.56 - 14.5" P/W - FDE - Primary Arms Exclusive

The Daniel Defense DD4 RIS II Barreled AR-15 Upper Receiver is a Primary Arms Exclusive build around a 14.5" cold hammer forged barrel and DD's SOCOM-derived RIS II quad rail, finished in Flat Dark Earth for builders who want combat-proven components with an NFA-free 16" legal barrel length.

Features:

• 14.5" cold hammer forged chrome moly vanadium barrel, pinned and welded to 16" legal length
• M4 profile, chrome-lined bore, mil-spec heavy phosphate coating
• HP tested and magnetic particle inspected
• 1:7 twist, mid-length direct impingement gas system
• Pinned low-profile 4140 steel gas block
• Daniel Defense RIS II free-float quad rail with patented Bolt-Up barrel nut system
• Removable lower rail section for M203 grenade launcher compatibility
• Daniel Defense extended flash suppressor, 17-4 PH stainless with salt bath nitride finish
• Mil-Spec 7075-T6 upper receiver, Type III hard coat anodized, Flat Dark Earth
• Bolt carrier group and charging handle not included

The RIS II's patented Bolt-Up barrel nut system creates a rigid two-piece structure that resists deflection under accessory load, holding point of impact where lesser rail systems introduce variance. The pinned and welded flash suppressor brings this 14.5" barrel to a legal 16" overall length, so it goes on a standard rifle lower without NFA paperwork.

Daniel Defense has supplied duty-grade AR-15 rifles and components to U.S. special operations units, law enforcement, and civilian shooters for over two decades, and this Primary Arms Exclusive upper carries that same mil-spec pedigree.