Daniel Defense DD4 SPRIII - Geissele Trigger

The Daniel Defense DD4 SPRIII is a 5.56 NATO rifle designed around the MK12-style platform, incorporating modern components while retaining key characteristics associated with precision-oriented AR-pattern rifles. It features an 18-inch stainless steel MK12-profile barrel with a rifle-length gas system, paired with a low-profile gas block and direct impingement operation. This configuration is intended to support consistent cycling and extended-range performance.

Updates include a 15-inch RIS III handguard with M-LOK compatibility and an integrated ARCALOCK bottom section for mounting bipods and accessories. The rifle is equipped with a Geissele Super Semi-Automatic (SSA) trigger, a Magpul PRS Lite stock for adjustable fit, and fully ambidextrous controls on the lower receiver. The DD4 SPRIII is supplied with a Daniel Defense magazine and ships in a hard plastic case.

 
Specifications

• Caliber: 5.56mm NATO
• Barrel Length: 18 in
• Barrel Profile: MK12
• Barrel Material: Stainless steel, cold hammer forged
• Twist Rate: 1:7
• Gas System: Rifle-length, direct impingement
• Muzzle Thread: 1/2 × 28 TPI
• Handguard: RIS III 15.0 with M-LOK and full-length ARCALOCK bottom panel
• Trigger: Geissele Super Semi-Automatic (SSA)
• Overall Length: 34 3/4 in – 37 7/8 in (with muzzle device)
• Weight: 8.6 lb