Daniel Defense MK18 RIII URG | 5.56mm | 10.3in

The Daniel Defense MK18 RIII URG is an upper receiver group intended for compact, carbine-style AR configurations. It features a 10.3″ threaded barrel and Daniel Defense’s Black RIS III 9.5″ M-LOK rail, with a carbine-length gas system and a GRIP-N-RIP charging handle. This configuration is suited to range training and short-course competition where a compact, reliable upper is preferred.

Product Specifications

• The finish is Matte Black for a low-reflective appearance.
• The barrel measures 10.3 inches for compact handling.
• The caliber/gauge is listed as .223 REM/5.56 NATO in the product data.
• The rail is a Black RIS III 9.5″ M-LOK for accessory mounting.
• The gas system is a Carbine Length Gas System matched to the platform.
• The charging handle included is a GRIP-N-RIP Charging Handle.
• The NFA thread pattern is 1/2×28.
• The rate of twist is 1-in-7″.
• The product weight is listed as 3.5 lbs..
• The overall length is 28.6 inches.
• The unit is designated as Accessory-Uppers in product type.
• The special feature listed is a Threaded Barrel.
• The upper ships with No Sights installed.
• The country of origin is US.
• The UPC is 818773023351.

The MK18 RIII URG upper brings Daniel Defense’s established rail and barrel platform into a compact package suitable for precise short-range applications and competitive carbine stages. Its threaded 10.3″ barrel, RIS III M-LOK rail, and carbine-length gas system deliver a balance of durability and maneuverability for users who prefer a compact AR-style upper that accepts common muzzle devices and accessories.