Built for shooters demanding premium performance in a compact platform, the Daniel Defense DDM4 300S Upper Receiver Group delivers exceptional reliability and hard-hitting .300 Blackout capability in a short-barreled configuration. Featuring a 10.3" cold hammer forged barrel with Daniel Defense’s proprietary S2W profile, this upper is optimized for suppressed and unsuppressed use alike.
Designed around the versatile .300 BLK cartridge, the DDM4 300S uses standard AR-15/M16 bolts and magazines while delivering increased muzzle energy over comparable 5.56 platforms. Whether for duty, home defense, training, or range use, this upper offers premium Daniel Defense quality in a fast-handling package.
Features:
- 10.3" Cold Hammer Forged Chrome-Lined Barrel
- Chambered in .300 Blackout
- 1:8 Twist Rate
- Pistol-Length Gas System
- Daniel Defense DDM4 Rail 9.0 Quad Rail Handguard
- Daniel Defense Flash Suppressor
- M16 Profile Bolt Carrier Group Included
- Ambidextrous GRIP-N-RIP Charging Handle
- Mil-Spec 7075-T6 Forged Upper Receiver
- Uses Standard AR-15 / M16 Lower Receivers
- Made in the USA
Specifications:
- Caliber: .300 AAC Blackout
- Barrel Length: 10.3"
- Gas System: Pistol Length
- Weight: 3.65 lbs
- Muzzle Thread: 5/8x24
- Rail System: Picatinny Quad Rail
Upper receiver only. Lower receiver, sights, and accessories not included.
NFA rules may apply depending on host firearm configuration.
| Color | Black |
| Manufacturer Part # | 23-088-19020-047 |
| Subcategory | Complete Upper Receivers |
| Fit | AR Rifles |
| Type of Barrel | 1:8 |
| Type | Upper |
| Caliber | 300 BLACKOUT |
| Barrel Length | 10.3" |