Daniel Defense DD4 MK18 RIII 5.56 NATO Pistol

10.3" Cold Hammer Forged Barrel - RIS III 9.5" M-LOK - Modern Evolution The Daniel Defense DD4 MK18 RIII 5.56 NATO pistol is a compact, duty-grade AR-pattern platform built for reliability, durability, and exceptional maneuverability in close-quarters and defensive applications. Featuring a cold hammer forged 10.3-inch government profile barrel with 1:7 twist rate and carbine-length direct impingement gas system, delivering consistent accuracy and long service life. Equipped with the Daniel Defense RIS III 9.5-inch free-float handguard providing enhanced strength and versatile M-LOK accessory mounting capability. Finished in Flat Dark Earth for added corrosion resistance and visual appeal. Includes SB Tactical SBA3 stabilizing brace for adjustable support, Daniel Defense flash hider, ambidextrous safety selector, and dependable Mil-Spec trigger. Weight 5.88 lbs. Overall length 26.75" - 29.88" (brace positions). Includes one 32-round magazine. SKU: 02-191-13295-047-DD, MPN: 02-191-13295-047, UPC: 818773025232.

MK18 Heritage with Modern Evolution

The DD4 MK18 RIII honors the legendary MK18 platform that has proven itself in special operations use worldwide while incorporating modern enhancements. The RIS III handguard represents the evolution from the classic quad-rail RIS II, delivering M-LOK attachment capability with reduced weight while maintaining the strength and reliability expected from Daniel Defense.

10.3" Cold Hammer Forged Barrel

The 10.3-inch barrel is cold hammer forged from Chrome Moly Vanadium steel—an intense hydraulic pressure process that forms exceptionally accurate and durable barrels. The government profile provides optimal balance between weight and rigidity. The 10.3-inch length matches the configuration used for CQB operations, providing ideal balance between velocity, maneuverability, and effectiveness at typical engagement ranges.

1:7 Twist Rate

The 1:7 twist rate stabilizes a wide range of bullet weights including heavier 77-grain match ammunition and barrier-blind projectiles. This faster twist rate ensures reliable stabilization of modern defensive and duty ammunition while maintaining accuracy with standard 55-grain and 62-grain loads.

Carbine-Length Gas System

The carbine-length direct impingement gas system ensures reliable cycling across diverse ammunition types and environmental conditions. The carbine gas length proves optimal for 10.3-inch barrels, providing sufficient dwell time for consistent function while managing back pressure for durability.

RIS III 9.5" M-LOK Handguard

The Daniel Defense RIS III 9.5-inch free-float handguard represents the modern evolution of the proven RIS II system. Featuring M-LOK attachment slots for accessories while reducing weight compared to quad-rail designs. The free-float design ensures barrel harmonics remain unaffected by handguard pressure or mounted accessories. CNC machined from 6061-T6 aluminum for exceptional strength-to-weight ratio.

M-LOK Attachment System

M-LOK slots provide versatile accessory mounting capability including lights, lasers, vertical grips, hand stops, and sling mounts. The M-LOK system enables low-profile attachment without the bulk of continuous Picatinny rails, reducing weight and snag points while maintaining rigidity for mounted accessories.

Flat Dark Earth Finish

The Flat Dark Earth finish provides distinctive appearance while delivering superior corrosion resistance and wear protection. The FDE Cerakote ceramic coating withstands environmental exposure, moisture, and abrasion better than traditional finishes. The tan color scheme reduces visibility in many operational environments.

SB Tactical SBA3 Pistol Stabilizing Brace

The SB Tactical SBA3 pistol stabilizing brace provides 5 positions of adjustability for different arm lengths and shooting positions. Integral ambidextrous QD swivel attachment points enable sling mounting on either side. The SBA3 design improves handling and stability during firing while maintaining pistol classification, eliminating NFA registration requirements. Adjustable length ranges from 26.75" to 29.88" overall.

Ambidextrous Safety Selector

The ambidextrous safety selector accommodates both right- and left-handed shooters. The ambi design enables manipulation from either side, improving accessibility and speed for shooters regardless of shooting hand or position. This enhanced control proves valuable in dynamic shooting situations.

Daniel Defense Mil-Spec Trigger

The Daniel Defense Mil-Spec trigger provides reliable, consistent performance with familiar AR-15 characteristics. The trigger delivers proven functionality for defensive and duty applications with dependable reset and appropriate pull weight for tactical use.

Daniel Defense Flash Hider

The Daniel Defense flash hider reduces muzzle flash signature, improving shooter's ability to maintain sight picture during rapid fire and low-light shooting. The flash hider features 1/2x28 threading for suppressor attachment, enabling sound suppressor use for training or tactical applications.

32-Round Magazine Capacity

The included 32-round detachable magazine provides substantial capacity for extended engagements, training, or defensive applications. The higher capacity reduces reload frequency during high-volume shooting while remaining compatible with standard STANAG/AR-15 magazine pouches and carriers.

Compact Overall Length

At 26.75" to 29.88" overall length depending on brace position, the DD4 MK18 RIII delivers exceptional maneuverability in confined spaces. The compact dimensions prove ideal for vehicle use, structure entry, home defense, and situations where full-size rifles prove unwieldy.

Lightweight at 5.88 lbs

At just 5.88 lbs unloaded, the DD4 MK18 RIII provides manageable weight for extended carry or dynamic movement. The lightweight design reduces fatigue during training or operational use while the cold hammer forged barrel and robust construction maintain durability.

Non-NFA Pistol Configuration

As a pistol rather than Short Barreled Rifle, the DD4 MK18 RIII does not require NFA registration, tax stamp, or Form 4 approval. This classification enables immediate transfer upon purchase while providing compact dimensions and CQB capability.

Duty-Grade Construction

Built to duty-grade standards, the DD4 MK18 RIII proves suitable for professional law enforcement and military use while remaining accessible to civilian shooters. The cold hammer forged barrel, precision manufacturing, and quality control ensure reliability under demanding conditions.

Trusted by Professionals

Daniel Defense firearms are trusted by professional and recreational shooters worldwide. The DD4 MK18 RIII continues this tradition with proven design, modern enhancements, and the quality control that distinguishes Daniel Defense products. The Daniel Defense DD4 MK18 RIII delivers compact duty-grade performance with modern M-LOK capability—the evolution of a legend for close-quarters excellence.

SPECIFICATIONS

• Manufacturer: Daniel Defense
• Model: DD4 MK18 RIII
• SKU: 02-191-13295-047-DD
• Manufacturer Part Number: 02-191-13295-047
• UPC: 818773025232
• Configuration: Pistol (non-NFA)
• Platform: AR-15
• Caliber: 5.56 NATO (5.56x45mm NATO) (.223 Remington compatible)
• Action: Semi-Automatic
• Operating System: Direct Impingement
• Barrel Length: 10.3 inches
• Barrel Type: Cold Hammer Forged (CHF)
• Barrel Profile: Government
• Barrel Material: Chrome Moly Vanadium Steel
• Twist Rate: 1:7 inches
• Barrel Thread Pitch: 1/2x28
• Gas System Length: Carbine
• Handguard: RIS III 9.5 inches
• Rail System: RIS III M-LOK Free-Float
• Handguard Material: 6061-T6 Aluminum, CNC Machined
• Handguard Finish: Flat Dark Earth (FDE)
• Brace: SB Tactical SBA3 Stabilizing Brace
• Brace Positions: 5 positions of adjustability
• Brace Features: Integral ambidextrous QD swivel attachment points
• Overall Length: 26.75" - 29.88" (brace positions)
• Weight: 5.88 lbs (unloaded)
• Safety: Ambidextrous Safety Selector
• Trigger: Daniel Defense Mil-Spec Trigger
• Muzzle Device: Daniel Defense Flash Hider
• Finish: Flat Dark Earth (FDE)
• Magazine Type: Detachable (STANAG/AR-15 compatible)
• Magazine Capacity: 32 rounds
• Magazines Included: 1
• Handedness: Right Hand
• Condition: New
• Product Type: Rifle (classified as pistol for NFA purposes)
• NFA Status: Non-NFA (pistol classification)
• Build Grade: Duty-Grade
• Applications: Close-quarters battle, defensive use, law enforcement, home defense, tactical training
• Heritage: MK18 platform evolution with modern RIS III M-LOK handguard