Daniel Defense DDM4 300 S Upper Receiver Group
10.3" .300 Blackout URG optimized for suppressed shooting with S2W barrel profile and 1:7 twist.
- Price
- $1,571
- Weight
- 3 lb 10.4 oz
- Brand
- Daniel Defense
- Category
- Uppers
Featured in
Features
- •.300 AAC Blackout
- •10.3" CHF S2W barrel
- •Pistol gas
- •DDM4 Rail 9.0" Picatinny
- •BCG & GRIP-N-RIP CH included
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Daniel Defense DDM4 300 S, URG, 300 AAC Blackout, 1/8, S2W, LPG, DDM4 Rail 9.0, DDFS Complete Upper Receiver w/ Flash Hider, Black, 10.3in, 23-088-19020-047
Ddm4 300s 10.3'''' 300 Aac Blackout Upper Receiver Black - Ddm4 300 S 10.3'''' 300 Aac Blackout 1-8 9'''' Ddm4 Rail Upper
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90-day low $1164.24More AR-15 guides & articles
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Overview
The DDM4 300 S Upper Receiver Group is Daniel Defense's purpose-built .300 AAC Blackout platform, optimized for both suppressed and unsuppressed shooting. The 10.3" barrel features Daniel Defense's proprietary S2W (Strength-to-Weight) heavy profile, providing enhanced accuracy and heat dissipation while maintaining reasonable weight.
The 1:7 twist rate supports both supersonic and subsonic .300 Blackout ammunition effectively. Subsonic 220gr loads perform exceptionally well suppressed, while supersonic 110-125gr loads deliver rifle-like terminal performance at CQB distances. The pistol-length gas system ensures reliable cycling across the full spectrum of .300 Blackout ammunition.
The DDM4 Rail 9.0" handguard provides Picatinny rails for mounting accessories, with included Santoprene rail panels for heat protection and improved grip. Like all Daniel Defense uppers, this package includes the M16 profile bolt carrier group (MPI tested) and GRIP-N-RIP ambidextrous charging handle.
Key Features
- Cold hammer forged 10.3" S2W barrel, chrome lined, HP/MPI tested
- 1:7 twist for subsonic and supersonic .300 BLK
- Pistol-length gas system for reliable .300 BLK cycling
- DDM4 Rail 9.0" handguard with Santoprene rail panels
- M16 profile BCG, MPI tested with properly staked gas key
- GRIP-N-RIP ambidextrous charging handle
- Daniel Defense flash suppressor (5/8x24 threads)
Pros
- +1:7 twist supports the full .300 BLK ammunition spectrum
- +S2W barrel profile balances accuracy and heat management
- +Excellent suppressor host with proper gas tuning
- +Complete package with BCG and charging handle
- +Daniel Defense quality and warranty
- +Standard AR-15 lower compatible
Cons
- −Premium pricing for .300 BLK upper
- −10.3" barrel requires SBR or pistol configuration
- −Heavier S2W barrel adds weight vs. government profile
- −Quad rail style heavier than M-LOK alternatives
- −.300 BLK ammunition more expensive than 5.56 NATO
Detailed Specifications
- caliber
- .300 AAC Blackout
- barrelLength
- 10.3"
- barrelProfile
- S2W (Strength-to-Weight) Heavy
- barrelMaterial
- Chrome Moly Vanadium Steel, Cold Hammer Forged
- barrelFinish
- Chrome Lined, Mil-Spec Heavy Phosphate
- twist
- 1:7
- gasSystem
- Pistol Length, Direct Impingement
- gasBlock
- Pinned Low Profile, 4140 Steel, Phosphate
- handguard
- DDM4 Rail 9.0", 6061-T6 Aluminum, Picatinny
- upperReceiver
- 7075-T6 Aluminum, Type III Hard Coat Anodized
- bcg
- M16 Profile, MPI Tested, Chrome Lined
- chargingHandle
- GRIP-N-RIP, 7075-T6 Aluminum, Ambidextrous
- muzzleDevice
- DD Flash Suppressor, 17-4 PH SS, Salt Bath Nitride
- threadPitch
- 5/8x24
- weight
- 3.65 lbs
- madeIn
- USA
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Build Your Custom Configuration
Add the Daniel Defense DDM4 300 S Upper Receiver Group to your build and see how it enhances your platform.