The Daniel Defense DDM4 300S Upper Receiver Group (Daniel Defense part no. 23-088-19020-047) is built for shooters who want a compact, high-performance .300 Blackout. It is built around a 10.3-inch barrel and uses standard 5.56 bolts and magazines to deliver .30 caliber projectiles with more muzzle energy than comparable 5.56 platforms. Factory ammunition covers home defense, target shooting, hunting, suppressed operation and tactical use. The DDM4 Rail 9.0 handguard and an independently ambidextrous GRIP-N-RIP charging handle complete the package. Daniel Defense makes it in the USA.

Key Specifications

• Caliber is .300 AAC Blackout, which feeds from standard 5.56 magazines.
• The barrel is 10.3 inches of cold hammer forged chrome moly vanadium steel in the S2W profile.
• Twist rate is 1:8, suited to the cartridge.
• The bore is chrome lined and mil-spec phosphate coated.
• The gas system is pistol length direct impingement with a pinned low-profile gas block.
• The muzzle device is a Daniel Defense flash suppressor in 17-4 PH stainless.
• The handguard is the DDM4 Rail 9.0, machined from 6061-T6 aluminum.
• Rail panels are Santoprene, heat resistant to 300 degrees Fahrenheit.
• The charging handle is the GRIP-N-RIP, independently ambidextrous.
• The group weighs 3.65 pounds.

Frequently Asked Questions

Does the DDM4 300S use standard 5.56 parts? It uses standard 5.56 bolts and magazines, with an M16 profile bolt carrier group included.

Does it include sights? No. Sights are sold separately.

What can I use it for? Daniel Defense lists home defense, target shooting, hunting, suppressed operation and tactical use, with a wide range of factory ammunition available.

Buy the Daniel Defense DDM4 300S Upper Receiver Group, .300 AAC Blackout, 10.3-Inch

Order it with our other AR-15 uppers from our Lubbock, Texas gun shop for fast, insured shipping.