Daniel Defense MK18 Upper | 10.3″ Barrel | 5.56 NATO

The Daniel Defense MK18 Upper Receiver Group is a complete AR-style upper built around a 10.3-inch cold-hammer-forged barrel and the MK18 RIS II handguard. It ships as a factory-configured upper group that includes an M16-profile bolt carrier group and an ambidextrous GRIP‑N‑RIP charging handle. This configuration is intended for shooters who need a compact, mission-derived carbine upper for close-quarters training and range/tactical drills; it is not a complete firearm until installed on a compatible lower.

Product Specifications

• The manufacturer is Daniel Defense.
• The model is MK18.
• The manufacturer part number is 23-004-08013-011.
• This item is supplied as a complete upper receiver group compatible with AR rifles.
• The cartridge/chamber is .223 Rem / 5.56x45mm NATO.
• The barrel measures 10.3 inches in length.
• The barrel uses a 1:7 twist rate and a Government contour.
• The barrel is described by the manufacturer as cold hammer forged chrome moly vanadium steel with a chrome-lined bore and phosphate coating.
• The gas system is a carbine-length direct impingement with a pinned low-profile 4140 steel gas block.
• The handguard is a DD RIS II MK18 machined from 6061-T6 aluminum.
• The upper receiver is machined from 7075-T6 aluminum with M4 feed ramps and Type III hard coat anodize listed by the manufacturer.
• The charging handle is the ambidextrous GRIP‑N‑RIP style.
• The muzzle device is a Daniel Defense flash suppressor in 17-4 PH stainless steel and the threaded pattern is 1/2×28.
• The bolt carrier group is an included M16-profile, chrome-lined unit with a properly staked gas key.
• The UPC is 852548002592.

Built from purpose-driven components, this MK18 upper brings a compact, service-derived layout to AR platforms for shooters focused on close-quarters handling and professional-style training. The combination of a short cold-hammer-forged barrel, a robust RIS II interface, and a factory-supplied M16-profile BCG delivers a turnkey upper that integrates with standard AR lowers and aftermarket optics or accessories.