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Swiss Schmidt-Rubin Straight-Pull Rifle Database

The Daniel Defense SPR III is the modern evolution of the legendary MK12 Special Purpose Rifle platform. Chambered in 5.56x45mm NATO, it pairs an 18" stainless MK12-profile barrel with a DLC finish, a rifle-length gas system, a 15" RIS III handguard with integrated ARCALOCK bottom panel, and a Geissele SSA match trigger. A semi-automatic precision platform engineered for long-range shooting, DMR use, and discerning shooters demanding shot-to-shot consistency.

Built at Daniel Defense's Black Creek, Georgia facility, the SPR III carries every Daniel Defense hallmark — Mil-Spec 7075-T6 receivers with Type III Hard Coat Anodize, M16-profile chrome-lined MP-tested BCG, fully ambidextrous controls (safety, bolt catch, magazine release, charging handle) — paired with a Magpul PRS Lite stock adjustable for length of pull and cheek height. Today's Daniel Defense benchmark for 5.56 semi-auto precision.

• Caliber: 5.56x45mm NATO
• Action: Semi-automatic, direct impingement
• Barrel: 18" (457 mm), Cold Hammer Forged, MK12 heavy profile, proprietary stainless steel, DLC finish, HP/MPI tested
• Twist rate: 1:7"
• Gas system: Rifle length
• Gas block: MK12 low profile, 416 hardened stainless steel, CNC machined, black oxide coating
• Muzzle device: Daniel Defense Flash Suppressor
• Muzzle thread: 1/2x28 TPI
• Handguard: RIS III 15.0 with integrated ARCALOCK bottom panel, M-LOK, 6061-T6 aluminum, Type III Hard Coat Anodized, free-float
• Upper & lower receivers: Mil-Spec, CNC machined 7075-T6 aluminum, Type III Hard Coat Anodized
• BCG: M16 profile, Mil-Spec MP tested, chrome lined, properly staked gas key
• Charging handle: Fully ambidextrous
• Safety: Ambidextrous
• Trigger: Geissele Super Semi-Automatic (SSA) match trigger
• Stock: Magpul PRS Lite, adjustable for length of pull and cheek height
• Controls: Fully ambidextrous (safety, bolt catch, magazine release, charging handle)
• Magazine included: Daniel Defense 32-round
• Overall length: 883 – 962 mm (34 3/4" – 37 7/8", with muzzle device)
• Weight: 3.9 kg (8.6 lb) unloaded
• Finish: Black (Type III anodize + barrel DLC)
• Made in USA — Black Creek, Georgia

• 18" stainless MK12-profile DLC barrel: long-range precision inherited from the SOCOM Special Purpose Rifle program, DLC finish for longevity and corrosion resistance.
• Geissele SSA trigger: world-class match trigger — crisp break, short and clean reset, perfect consistency for precision shooting.
• RIS III + ARCALOCK handguard: the integrated ARCALOCK bottom panel allows direct mounting of bipods, tripods, and shooting bags without adapters — essential for positional precision.
• Magpul PRS Lite stock: length-of-pull and cheek-height adjustable — perfect eye-to-optic alignment and stable position across firing stances.
• MK12 low-profile gas block: discreet under the handguard, consistent cycling, softer recoil impulse.
• M16 chrome-lined MP-tested BCG: military-grade reliability, lasting lubricity, maximum service life.
• Fully ambidextrous controls: instant strong-hand / support-hand transitions, ideal for dynamic and positional disciplines.

• Semi-auto precision shooting: PRS Gas Gun disciplines, long-range sport shooting to 600 m and beyond.
• Tactical / DMR use: ideal designated marksman configuration, 200–600 m engagements.
• Sport shooting: consistent platform for target shooting and semi-auto competitions.
• Small game and predator hunting: authorized for fox and corvids (⚠️ 5.56 NATO is prohibited for big-game hunting in Switzerland).
• Suppressor host: the 18" barrel with 1/2x28 thread accepts 5.56 suppressors for suppressed shooting.
• Collection: modern evolution of a legendary platform — a reference for high-end AR-15 collectors.

• 1 Daniel Defense SPR III 18" 5.56 NATO rifle
• 1 Daniel Defense 32-round magazine
• 1 Daniel Defense Full-Latch Impact Plastic Case
• Owner's manual, manufacturer warranty card