Daniel Defense DD4 SPRIII Rifle 5.56mm 32rd Magazine 18" Barrel 15" Handguard

The Daniel Defense DD4 SPRIII rifle in 5.56mm is a semi-automatic precision rifle built on the legacy of the legendary Mk12 Special Purpose Rifle. Engineered to meet the demands of Special Operations Forces, this 18-inch barreled rifle delivers the accuracy, durability, and modularity serious shooters and precision-minded hunters expect. With an 18-inch stainless steel barrel, rifle-length gas system, and a fully ambidextrous lower receiver, the SPRIII is equally at home on a precision range, in a hunting application where flat-shooting accuracy matters, or anywhere in between.

Daniel Defense engineered the SPRIII around a cold hammer-forged, MK12-profile barrel with DLC coating—a combination that promises exceptional longevity and shot-to-shot consistency. The rifle-length gas system and MK12 gas block are built to Naval Surface Warfare Center Crane Division specifications, ensuring reliable operation across a range of ammunition types and conditions. The 15-inch RIS III handguard, modeled after the SOCOM-proven RIS II design, gives you M-LOK attachment points and a full-length ARCALOCK bottom panel for accessory mounting without the bulk of older systems.

Ambidextrous controls throughout the lower receiver mean you can manipulate the safety, mag release, and charging handle from your firing side—no hand repositioning needed. The Timney Armorer's Series two-stage curved trigger breaks cleanly and consistently. Muzzle threading (1/2 x 28 TPI) accepts standard suppressors or the included DD Flash Suppressor, and the Magpul PRS Lite stock provides solid cheek weld and adjustability without excess weight. At 8.6 pounds unloaded, the SPRIII strikes a practical balance between a handheld rifle and a precision platform.

This is a rifle for shooters who understand that precision is about the sum of its parts—clean trigger, quality barrel, free-floating performance, and smart ergonomics. Whether you're dialing in distance shots, training for high-level shooting, or hunting in terrain where accuracy and reliability set you apart, the SPRIII earns its reputation.

Key Features

• 18-inch cold hammer-forged stainless steel barrel with MK12 profile and DLC coating for accuracy and durability
• Rifle-length gas system with MK12 gas block built to Naval Surface Warfare Center Crane Division specifications
• 15-inch RIS III modular handguard with M-LOK slots and full-length ARCALOCK bottom panel for accessory compatibility
• Fully ambidextrous lower receiver for intuitive operation without repositioning your grip
• Timney Armorer's Series two-stage curved trigger for clean, consistent breaks
• Magpul PRS Lite buttstock for comfort and repeatability
• 1/2 x 28 TPI muzzle threading; includes DD Flash Suppressor
• Compact overall length (34.75–37.875 inches depending on stock position) without sacrificing sight radius or barrel performance

Specifications

Frequently Asked Questions

What makes the SPRIII different from a standard 5.56 rifle?

The SPRIII is purpose-built around precision and reliability. The 18-inch cold hammer-forged barrel with MK12 profile, rifle-length gas system tuned to Naval Crane Division specs, and Timney two-stage trigger combine for accuracy and consistency that outclass typical AR-platform rifles. It's engineered for shooters who demand more from their platform.

Is the Daniel Defense SPRIII ambidextrous?

The lower receiver is fully ambidextrous, allowing you to operate the safety, magazine release, and charging handle from either side without repositioning your firing grip. The upper and barrel are configured for standard right-hand ejection.

What accessories can I mount on the RIS III handguard?

The 15-inch RIS III rail features M-LOK slots and a full-length ARCALOCK bottom panel, making it compatible with standard M-LOK and ARCALOCK-compatible accessories from manufacturers like Magpul, Midwest Industries, and others. The modular design lets you build the exact configuration you need.

Can I add a suppressor to the SPRIII?

Yes. The barrel is threaded 1/2 x 28 TPI and includes a DD Flash Suppressor. The muzzle threads accept standard suppressors rated for 5.56 NATO.