Knight's Armament SR-15 KS-4 Ambi 5.56 NATO Rifle 16" Barrel - Upgraded E3.2 Bolt

Knight's Armament SR-15 KS-4 Ambi 5.56 NATO Rifle 16" Barrel - Upgraded E3.2 Bolt

Experience the pinnacle of modern combat rifle engineering with the Knight’s Armament KAC KS-4 SR-15. As the highly anticipated next evolution of the legendary SR-15 lineup, this premium 16-inch tactical rifle improves upon the iconic Mod 2 by introducing the cutting-edge URX 6 handguard and fully ambidextrous lower receiver controls. Built around a relentlessly durable, cold hammer-forged 5.56 NATO chrome-lined barrel and KAC's proprietary mid-length gas system, the KS-4 delivers incredibly flat shooting, reduced felt recoil, and unmatched long-term reliability. At its core beats the revolutionary E3.2 dual-ejector bolt, guaranteeing flawless, surgical performance even when running suppressed. Whether you are outfitting for duty, home defense, or high-stakes precision shooting, the KAC KS-4 SR-15 offers the ultimate blend of modularity, speed, and rugged dependability. Step up to uncompromising quality and dominate any environment.

Next-Generation URX 6 Handguard
The fully free-floated 15-inch URX 6 rail provides immense M-LOK and Picatinny mounting space for optics, lasers, night vision, and accessories while seamlessly protecting the gas system.

Advanced E3.2 Bolt Design
Features a revolutionary round-lug design, a robust lobster-tail extractor, and dual ejectors to ensure positive, ultra-reliable extraction and ejection—especially optimized for suppressor use.

Proprietary Mid-Length Gas System
Custom-engineered by Knight's Armament to significantly increase durability and operational lifespan while mitigating felt recoil for remarkably fast follow-up shots.

Fully Ambidextrous Controls
Designed for seamless ergonomics, the lower receiver boasts a fully ambidextrous bolt release, safety selector, and magazine release, making it perfect for left-handed operators or dynamic shoulder transitions.

Match-Grade 2-Stage Trigger
A drop-in two-stage trigger system that effortlessly bridges the gap between precision marksmanship and surgical speed in close-quarters engagements.

QDC-Compatible Flash Eliminator
The advanced 3-prong flash hider drastically reduces muzzle signature without annoying tuning-fork ringing, and it serves as a direct mount for KAC 5.56mm QDC signature reduction devices.

Cold Hammer-Forged Durability
The 16-inch light-profile CrMoV barrel is heavily chrome-lined and built to rigorous military specifications, ensuring phenomenal accuracy and an extended barrel life.

Specifications

• Part Number: 121442
• UPC: 819064019244
• Caliber: .223 Remington / 5.56mm NATO
• Capacity: 30+1
• Barrel Length: 16" (40.64 cm)
• Barrel Type: Light Profile, Cold Hammer Forged CrMoV, Chrome Lined
• Twist Rate: 1:7"
• Gas System: KAC Proprietary Mid-Length
• Bolt Carrier Group: E3.2 Round-Lug Bolt with Dual Ejectors
• Handguard: 15" URX 6 M-LOK Rail
• Sights: KAC Micro Flip-Up Front and Rear; Optic Ready Full-Length Rail
• Muzzle Device: 5.56mm 3-Prong Flash Eliminator (QDC Compatible)
• Overall Length: 32.5" – 35.75" (with adjustable stock)
• Weight: 6.62 lbs (2.86 kg)
• Finish: Black
• Grip: Textured