Daniel Defense | DDM4 300S URG | 10.3-inch .300 AAC Blackout

The Daniel Defense DDM4 300S URG is a complete AR-style upper built for the .300 AAC Blackout cartridge using high-quality components and precise manufacturing. It features a compact 10.3-inch barrel and a 9.0-inch DDM4 rail, combined with a pistol-length gas system and a Grip-N-Rip charging handle for streamlined operation. The construction and finish are intended for long-term reliability and consistent performance in short-barrel AR builds. This upper is appropriate for compact-range precision work and general-purpose short-barrel field use.

Product Specifications

• The manufacturer is Daniel Defense.
• The model is DDM4 300S URG.
• The caliber is .300 AAC Blackout.
• The barrel length is 10.3-inch.
• The twist rate is 1-in-8.
• The upper includes a DDM4 Rail 9.0.
• The gas system is a Pistol Length Gas System.
• The charging handle is a Grip-N-Rip Charging Handle.
• The finish is Matte Black.
• The NFA thread pattern is 1/2×28.
• The contour is Government.
• The fit is listed as AR Rifles.
• The sights are listed as No Sights.
• The weight is 5.1.
• The UPC is 815604015134.

This complete upper is positioned for shooters who want a compact, factory-built solution when assembling a short-barrel AR in .300 AAC Blackout. Its combination of a short, threaded barrel, DDM4 rail, and pistol-length gas system makes it suitable for close-range precision tasks and short-barrel field applications where reliable, repeatable performance matters.