The Daniel Defense DD4 SPRIII is a semi-automatic AR-platform rifle developed as the next evolution of the MK12 Special Purpose Rifle concept. It pairs an 18-inch MK12-profile barrel with a rifle-length gas system and MK12 gas block to support extended-range precision work. The 15-inch RIS III handguard includes a full-length ARCALOCK bottom panel and M-LOK compatibility for mounting precision accessories. Fully ambidextrous controls and a Magpul PRS Lite stock provide ergonomic adjustment and stable shooting from varied positions.
Key Specifications
- This rifle is the Daniel Defense DD4 SPRIII.
- Chambered for .223 Rem / 5.56 NATO.
- The barrel measures 18 inches and uses an MK12 profile.
- The barrel is cold hammer-forged stainless steel with a DLC finish.
- Rate of twist is 1:7.
- The gas system is a rifle-length MK12 direct impingement system.
- The handguard is a 15-inch RIS III with a full-length ARCALOCK bottom panel.
- The stock is a Magpul PRS Lite.
- The rifle ships with one 32-round DD magazine.
- Unloaded weight is 8.6 lbs.
Designed for precision-oriented shooters who value a stable, configurable AR platform, the DD4 SPRIII pairs proven MK12 styling with modern modularity. Its combination of an 18-inch MK12-profile cold hammer-forged barrel, rifle-length gas system, RIS III handguard and a precision-adjustable PRS Lite stock makes it well suited for extended-range target work and disciplined, repeatable shooting. The platform’s ambidextrous controls and ARCALOCK-equipped handguard keep accessory options broad while preserving consistent ergonomics for precision setups.
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