Daniel Defense DDM4 300S 10.3″ .300 AAC Blackout Upper

The Daniel Defense DDM4 300S URG is a complete AR-15 upper chambered in .300 AAC Blackout with a 10.3″ barrel. It pairs a compact profile with a 9.0″ DDM4 rail and a pistol-length gas system for compact configurations. Components and finish reflect Daniel Defense manufacturing for consistent fit and finish on AR platforms.

Key Specifications

• This item is a Complete Upper Receiver for AR-15 rifles.
• The caliber is .300 AAC Blackout.
• The barrel measures 10.3″.
• The barrel twist is 1:8.
• The handguard is a DDM4 Rail 9.0.
• The gas system is Pistol Length Gas System.
• Included charging handle is a Grip-N-Rip Charging Handle.
• The thread pattern is 1/2×28.
• The weight is 3.65 lbs..
• The finish is Matte Black.

Designed for compact AR configurations, the DDM4 300S URG offers a concise, feature-rich package for shooters who require a finished, ready-to-install upper in .300 AAC Blackout. Its combination of rail space, threaded barrel and ergonomic controls provides a straightforward solution for builders and owners seeking a reliable, compact AR-15 upper.

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