Daniel Defense DDM4, 5.56 NATO, 10.3″ Cold Hammer Forged Barrel, Black, DD4 Flat Front 9.5″ Rail, 30 Rounds

Product Description

The Daniel Defense DDM4 is a compact, maneuverable pistol-configuration platform chambered in 5.56x45mm NATO. This SKU pairs a cold hammer forged 10.3-inch barrel with a purpose-built Maxim PDW stabilizing brace and an included Primary Arms SLx 1X MicroPrism Gen 2 optic. It delivers professional-grade reliability in a package built for close-quarters performance.

Every Daniel Defense firearm is hand assembled, quality assurance tested, and test fired before shipment. The forged 7075-T6 receivers use the same Mil-Spec foundation as duty rifles. The carbine-length direct impingement gas system cycles reliably despite the short barrel and compact footprint.

The DD4 Flat Front 9.5″ M-LOK rail free-floats the barrel and runs nearly to the muzzle. This design keeps accessory weight forward and minimal compared to quad-rail systems. The ambidextrous safety selector works identically for left- and right-handed shooters.

Materials & Construction

• Action: Semi-Automatic, Direct Impingement
• Lower Receiver: Daniel Defense DDM4 Lower Receiver, Forged 7075-T6 Aluminum, Type III Hard Coat Anodized, Ambidextrous Safety Selector
• Upper Receiver: Daniel Defense DDM4 Upper Receiver, Forged 7075-T6 Aluminum, Type III Hard Coat Anodized, Forward Assist and Dust Cover
• Barrel: 10.3″ Cold Hammer Forged, Daniel Defense Proprietary Heavy Profile, 1:7″ Twist, Chrome Lined, 1/2×28 Threaded Muzzle
• Gas System: Carbine-Length Direct Impingement Gas System with Low-Profile Gas Block
• Handguard: Daniel Defense DD4 Flat Front 9.5″ M-LOK Rail, Free-Float, M-LOK Attachment Points, Continuous Top 1913 Picatinny Rail, Type III Hard Coat Anodized
• Bolt Carrier Group: Daniel Defense Bolt Carrier Group, Mil-Spec MP Tested, HPT, with Properly Staked Gas Key
• Charging Handle: Daniel Defense Mil-Spec Charging Handle
• Trigger: Daniel Defense Mil-Spec Single-Stage Trigger
• Receiver Extension: Maxim Defense Proprietary Receiver Extension with Integrated Buffer System (supplied as part of the Maxim PDW brace assembly)
• Stabilizing Brace: Maxim PDW Stabilizing Brace, Multi-Position Adjustable, Collapsing
• Pistol Grip: Daniel Defense Pistol Grip, Glass-Filled Polymer with Soft-Touch Overmolding

Specifications

This firearm ships from the factory with a pistol stabilizing brace attached to a pistol-length receiver extension, configured as a pistol — not a rifle. A 2024 federal court ruling vacated ATF’s 2023 rule that reclassified braced pistols as Short-Barreled Rifles (SBRs), and the government dropped its appeal of that ruling in 2025. As a result, a stabilizing brace alone no longer causes a pistol to be treated as an SBR under the National Firearms Act (NFA). As configured and shipped, this pistol requires no NFA registration or tax stamp — only the standard ATF Form 4473 background check at transfer. Adding a shoulder stock would make it a short-barreled rifle (SBR). Since October 9, 2026, ATF no longer requires an approved Form 1 for that, but your state’s law still applies, and an SBR needs an approved ATF Form 5320.20 to cross state lines. Western Sport cannot advise on individual compliance — buyers are responsible for following all applicable federal, state, and local law.

Ordering from Western Sport

Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: What ammunition works best in the Daniel Defense DDM4 5.56 pistol?

A: The DDM4 fires both 5.56x45mm NATO and .223 Remington ammunition interchangeably. NATO-spec ammunition delivers slightly higher pressures and velocity. Both types cycle reliably through the carbine-length direct impingement gas system in this configuration.

Q: What optics, lights, and accessories mount on the DD4 Flat Front 9.5″ M-LOK rail?

A: The M-LOK rail accepts standard M-LOK-pattern lights, lasers, and hand stops. The continuous top 1913 Picatinny rail mounts red dots, magnifiers, and other optics. The included Primary Arms SLx 1X MicroPrism uses the Trijicon Mini-ACOG footprint and is night-vision compatible.

Q: Does the 1/2×28 threaded muzzle accept standard suppressors and flash hiders?

A: Yes. The 1/2×28 threading accepts any standard 5.56 flash suppressor, compensator, or suppressor. This is the same muzzle thread used on AR-15 rifles and carbines, ensuring broad accessory compatibility.

Q: What comes included with this Daniel Defense DDM4 pistol?

A: The package includes the pistol, one 30-round magazine, and the Primary Arms SLx 1X MicroPrism optic. Contact Western Sport for complete shipping and warranty details specific to this configuration.

Q: What is the M-LOK handguard on this pistol?

A: Daniel Defense’s free-float M-LOK handguard lets you attach lights, lasers, and grips directly to the rail using the M-LOK slot system — no separate rail sections required. Additionally, the handguard floats independently of the barrel, so attachments don’t shift your zero. A continuous top rail provides a stable mounting surface for optics.

Q: Will I need to file ATF paperwork or pay a tax stamp for this firearm’s brace?

A: No. As configured and shipped, this is a pistol with a stabilizing brace — not a Short-Barreled Rifle (SBR). ATF’s 2023 rule treating braced pistols as SBRs was vacated by federal courts in 2024, and the government dropped its appeal in 2025. Only the standard ATF Form 4473 background check applies at transfer, the same as for any other pistol. Installing a shoulder stock would change that — it would create an SBR and require an approved ATF Form 1 first.

Additional information