Daniel Defense DDM4, 5.56 NATO, 10.3″ Cold Hammer Forged Barrel, Bazooka Green, DD4 Flat Front 9.5″ Rail, 30RD GN Brc

Product Description

The Daniel Defense DDM4 is a purpose-built 5.56 NATO pistol engineered for shooters who demand compact maneuverability without compromise. This configuration pairs a proven 10.3-inch cold hammer forged barrel—the same length trusted by special operations M4A1 platforms—with a Maxim PDW stabilizing brace that collapses tighter than any mil-spec carbine stock.

The 9.5-inch DD4 Flat Front M-LOK rail free-floats the barrel and runs nearly to the muzzle. This design lets you mount lights, lasers, and hand stops far forward while keeping weight minimal. The DDM4’s short gas system cycles reliably through the brace’s integral buffer, so 5.56 feeding and function stay consistent shot after shot.

Every Daniel Defense firearm is hand-assembled, quality-assurance tested, and test-fired before shipment. Forged 7075-T6 receivers with Type III hard coat anodized finish meet mil-spec durability standards. The ambidextrous safety selector works identically for left- and right-handed operators. This package also includes a Primary Arms SLx 1X MicroPrism optic with ACSS Cyclops Gen 2 reticle.

Compact Power Built on Daniel Defense Standards

The 1/2×28 threaded muzzle accepts standard flash suppressors, compensators, and suppressors. The continuous top 1913 Picatinny rail pairs seamlessly with M-LOK accessory slots for endless configuration options. Whether you’re training, competing, or building a home-defense platform, the DDM4 delivers duty-grade reliability in a package that fits tight spaces.

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. Permanently configuring this firearm with a shoulder stock, however, would create an SBR requiring an approved ATF Form 1 before modification. Western Sport cannot advise on individual compliance — buyers are responsible for following all applicable federal, state, and local law.

Why Buy from Western Sport?

• Western Sport is staffed by shooters and hunters who understand Daniel Defense pistol platforms.
• We offer competitive pricing on every Daniel Defense SKU in our catalog.
• Expert guidance on optic mounting, rail systems, and accessory compatibility.
• Full after-sale support and warranty information for every firearm we sell.
• Fast, secure shipping to your dealer or local pickup available.

Frequently Asked Questions

Q: What ammunition works best in the DDM4’s 5.56 NATO chamber?

A: The 5.56x45mm NATO chamber accepts both 5.56 NATO and .223 Remington ammunition. 5.56 NATO mil-spec rounds are optimized for the DDM4’s short-gas-system performance and deliver reliable function across a wide velocity range.

Q: What optics, lights, and accessories mount on the M-LOK rail?

A: The DD4 Flat Front 9.5″ M-LOK rail accepts any standard M-LOK light, laser, hand stop, or vertical grip. The included Primary Arms SLx 1X MicroPrism mounts to the continuous top Picatinny rail using the Trijicon Mini-ACOG footprint.

Q: What comes in the box with this DDM4 package?

A: This exclusive configuration ships with the braced pistol, one 30-round magazine, and a Primary Arms SLx 1X MicroPrism Gen 2 optic with ACSS Cyclops Gen 2 red illuminated reticle included in the package. The optic is night-vision compatible and CR2032 powered.

Q: Is this a Title I handgun, or does it require NFA paperwork?

A: The DDM4 ships from the factory as a Title I handgun with a Maxim PDW stabilizing brace. It transfers as an ordinary pistol with no tax stamp, Form 1, or ATF registration required.

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